Embryology final

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139 Terms

1
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Where is the genetic information (DNA) for the cell housed?
Nucleus
2
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Name the organelle that is responsible for producing intracellular energy
Mitochondria

ATP powerhouse of the cell
3
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What phase of the cell cycle represents the initial resting stage
G1

Reduplication or resting phase
4
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What is mitosis
The duplication of somatic cells

Chromosomes each has 46
5
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What is meiosis
The duplication of sex cells

Chromosomes split in half

23 from mom and 23 from dad
6
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What apoptosis
Programmed cell death and fragmentation
7
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what is the purpose of the endometrium of the uterus
Provides the ideal environment for implantation and growth of the embryo
8
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Name the periods of prenatal development
Proliferative period 0-2

Embryonic period 2-8 most sensitive

Fetal period 8weeks-9months
9
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Name the two layers of skin
Epidermis develops from Ectodermal cells

Dermis develops from underlying mesoderm
10
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The three dilations that form the primary brain vesicles are
Fore brain

Midbrain

Hindbrain
11
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Identify the three types of connective tissue
Dense

Loose

Loose with special properties
12
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What is the job for the tendon
Connects muscles to bone
13
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Name the elements that compose the blood
RBC erythrocytes

WBC leukocytes

Platelets which are suspended in plasma
14
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Leukocytes migrate between endothelial cells by a process known as
Diapedesis
15
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name the most numerous WBC’s
Neutrophils

PMN’s
16
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The lymphatic system is composed of
Lymph nodes

Thymus

Spleen
17
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The initial skeletal component in the embryo is
Cartilage
18
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Name the three types of cartilage
Fibrous(vertebral discs)

Elastic (external ear)

Hyaline(glasslike)
19
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the process by which bone replaces cartilage is called
Endochondral bone formation
20
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As long as bones are still growing this line (plate) appears
Epiphyseal line (plate)

Known as growth plate
21
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Flat bones go through a direct transformation of connective tissue to bone in process known as
Intramembranous bone formation
22
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name the source of nutrition of an embryo for the first few weeks of life
VITELLINE vascular system
23
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Name the week that the heart begins to beat
4th week
24
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Three types of muscle tissue
SKeletal\*Voluntary striated

Smooth\*involuntary, smooth

Cardiac \*involuntary, striated with intercalated discs
25
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Name the system that becomes active in transporting oxygen and nutrition around the 4th week of life:
Umbilical system
26
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What period is a developing human __least__susceptible to teratogens:

•What period is it the __most__ susceptible:
Least susceptible- proliferative period

Most susceptible- embryonic period
27
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What cells do not undergo cell division
Neurons, skeletal muscle, cardiac muscle cells do not routinely undergo cell diviison
28
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four primary tissue types
Neural tissue

Epithelial

Connective

Muscle

Never ever call me
29
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Neural tissue is divided into two types
CNS -brain and spinal cord

PNS- Nerves and their ganglia
30
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What is the basic structural unit of the nervous system
Neuron - Axons conduct nerve impulses away from the cell body

\
Dendrites receive/ conduct impulses to the cell body
31
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How is epithelium described
Simple: single layer

Pseudostratified- all cells contact with he basal lamina, but not the surface

Stratified; several layers and only the basal cell layer is in contact with the basal lamina
32
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Impulses pass from the CNS to involuntary muscles by which system
Autonomic nervous system
33
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all sensations in the body are relayed to what system
CNS
34
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Axons that exist outside the CNS are protected and insulated by
Myelin sheath
35
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Which body system relies on neural stimuli to function
Endocrine system
36
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What do ligaments do
Attach bones directly bone to bone
37
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Name the classifications of bone
Compact (dense)

Cancellous (spongy; trabecular)
38
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what are the functions of blood
Conducts oxygen to the cells

•Clots blood to prevent blood loss

•Regulates pH through a buffering system

•Regulates body temperature and provides protection from bacteria

 
39
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The purpose of platelets
Clot formation
40
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The largest organ in the body
skin

Integumentary system
41
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Absorption of most of our nutrients occurs
In the small intestine
42
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Nerve processes carrying information from the peripheral nervous system in muscles and glands to the CNS are known as:
Afferent (sensory) system

–Responses from the CNS to muscles and glands are known as Efferent (motor) system
43
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What does the somatic nervous systme do
carries impulses to the voluntary or skeletal muscles (under conscious control(
44
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what does the autonomic nervous system do
CARRIES impulses from the CNS to involuntary muscles (autopilot)
45
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The purpose of the skeletal system
Framework to support muscles and ligaments

•Protection

•Hematopoietic system
46
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\`What type of bone protects the brain?
Membrane bone
47
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The major function of the urinary system is
To control blood volume and pressure and composition of the urine
48
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What are the special senses:
Vision

•Hearing

•Equilibrium

•Smell 

•Taste
49
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What forms from the 1st (mandibular) Pharyngeal Arch?
Bony mandible

Muscles of mastication

Nerves

Blood supply

Cheeks
50
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What develops from the 2nd hyoid arch
Facial muscles (smile)

Hyoid bone

Vessels
51
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When does the face develop
4th to 7th week
52
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What does the ectoderm (outer covering of the pharyngeal arches as well as the inner lining of 1st arch) become?
Epithelial lining of the oral cavity
53
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What will the endoderm (lining of the remaining pharyngeal arches) become?
The lining of the GI tract
54
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What does the 1st pharyngeal groove become?
External auditory canal - EAR
55
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What does the 2nd pharyngeal pouch become
Palatine tonsils
56
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What do the remaining pharyngeal pouches become
3rd pouch- inferior parathyroids and thymus

4th pouch- superior parathyroids

5th pouch- ultimobranchial body(gives rise to cells of the thyroid which produce calcitonin
57
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Define Ankyloses
A fusion of tooth roots ( a fusion of mineralized tissues with out an intervening PDL; usually due to trauma
58
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What is leeway space
The size difference between a primary molar and a permanent molar
59
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What tissue does not support the dentition
Tooth enamel

Cementum, alveolar bone and the PDL support dentition
60
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What occurs when the teeth have reached the functional phase
Occlusal contact of opposing arches as well as occlusal wear
61
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Visible ridges often observed on the cervical third of premolar teeth are referred to as
Perikymata

May be mistaken by RDH as calculus
62
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How thick is enamel at the occlusal or incisal surface
2\.5mm
63
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Obliterated tubules that are found in areas of attrition, abrasion, fracture or caries would be a sign of what type of dentin formation?
Sclerotic dentin
64
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where the glandular layer of tome’s located
1st layer of dentin on the root

Just beside the cementum
65
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Extensions of the odontoblast that can extend into the enamel are called
SPINDLES
66
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What year was commercial floss invented
1882
67
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What tooth substance is more elastic than enamel
Dentin
68
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What is the organic component of dentin
Collagen
69
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The cell-free region in dentin is known as what zone
Zone of Weil
70
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The apical foramen is slightly larger in which teeth
Maxillary
71
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An avoid calcification seen in the PDL would be called what
cementicle
72
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Why is cementum insensitive to pain
Cementum has no nerve or blood vessel innervation
73
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How wide is the PDL
0\.15-0.38
74
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What is the primary function of the PDL
Supporting the tooth
75
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A mass of cells located in the remnants of the root sheath are called:
Epithelial rests

Rests of malassez
76
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Maintenance of alveolar bone and cementum is reliant on what
Tooth function

Bone will resorb when teeth are no longer in function
77
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In what region does the alveolar crest appear pointed?

•Flat?
Anterior region- pointed

Posterior region-flat
78
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What can cause the PDL to become hylanized
Traumatic repetitive compression
79
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What movement does the lateral muscle provide for the mandible
Protrudes the mandible

Pulls the articulation disk forward
80
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A mature mandibular condyle exhibits what shape
Oval
81
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What membrane provides protection and nutrition to the TMJ
Synovial membrane
82
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where would lining mucosa be found in the oral cavity
Floor of the mouth

Ventral side of the tongue

Buccal mucosa
83
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Where would mastication mucosa be located in the oral cavity
Hard palate

Alveolar ridges
84
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Name the two layers of the lamina propria
Papillary layer

Reticular layer
85
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A thin, non-keratinized area of epithelium located IP between the buccal gingiva and lingual gingiva of each tooth is known as the:
Col
86
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Name the cells associated with inflammation
Leukocytes

Lymphocytes

Mast cells
87
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Which of the tonsils are large in children and have deep crypts?
Palatine tonsils
88
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Which of the salivary secretions is higher in carbohydrate content

Serous or mucous
Mucous
89
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What cells are produced in the germinal centers of the tonsils?
Lymphocytes
90
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Name the functional unit of the salivary gland
Alveolus (acinus)
91
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what type of calculus is often dark in color and tenacious
Subgingival calculus
92
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What are characteristics of subgingival plaque
Anaerobic

Gram-negative

Spirochetes rods filamentous organisms
93
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Where is calculus most often found intraorally
The opening of salivary ducts

Maxillary molars

\#3, #14 mandibular anteriors
94
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What cell forms the primary cuticle
Ameloblasts
95
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When the enamel crystals of the tooth breakdown how might this appear clinically?
White or brown spot on totoh
96
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Name the 2 movements of the TMJ
Hinge and gliding

Ginglymoarthroidal joint
97
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List the 3 tonsils that compose Waldyer’s ring
Palatine

Lingual

Pharyngeal adenoid
98
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What is the function of Sharpey’s fibers
Attach the tooth to the alveolar bone; they penetrate both cementum and alveolar bone through the PDL
99
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2 functions of the PDL
Supportive

Nutritive

Sensory

Maintenance
100
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What percentage of Americans have at least one cavity by the age of 17 years old?
78%