Anatomy Lab Practical 2: Muscle

Auburn University

Frontalis

Orbicularis Oculi

Lavator labii superioris

Zygomaticus minor

Orbicularis oris

Depressor labii inferioris

buccinator

Temporalis

Sternohyoid

Scalenes

splenius capitis

Occipitalis

Nasalis

Zygomaticus major

Risorius

Depressor anguli oris

Mentalis

Masseter

Omohyoid

Sternocleidomastoid

Lavator scapulae

Semispinalis capitis

orbicularis oculi

a: closes eyelids tightly, closes eyelids gently, compresses lacrimal sac

o: nasal part of frontal bone, frontal process of maxilla, medial palpebral ligament, lacrimal bone

I: skin of orbital region, lateral palpebral raphe, superior and inferior tarsal plates

buccinator

a: pulls angle of mouth laterally, presses cheeks to teeth, decreases the size of the oral vestibule

o: alveolar processes of maxilla and mandible, pterygomandibular raphe

i: angle of mouth, modiolus, blends with orbicularis oris muscle fibers

splenius capitis

a: extends head/neck, lateral flexion and rotation of the head

o: spinous processes of vertebrae C7-T3, nuchal ligament

I: lateral superior nuchal line of the occipital bone, mastoid process temporal bone

massester

a: bilateral contraction of the entire muscle is to elevate the mandible, raising the lower jaw

o: the maxillary process of zygomatic bone, inferior border of the zygomatic arch

i: lateral surface of ramus and angle of mandible

levator scapulae

a: draws scapula superomedially, rotates glenoid cavity inferiorly

o:transverse processes of vertebrae C1-C4

i: medial border of scapula

pectoralis major

serratus anterior

external intercostals

pectoralis minor

internal intercostals

rectus abdominis

external oblique

internal oblique

transverse abdominis

psoas major

psoas minor

iliacus

latissimus dorsi

deltoid

trapezius

erector spinae

teres major

teres minor

infraspinatus

rhomboid major

rhomboid minor

serratus posterior

supraspinatus

subscapularis

tensor fascia latae

gluteus maximus

gluteus medius

gluteus minimus

piriformis

superior & inferior gemellus

obterator internus

obterator externus

quadratus femoris

pectoralis major

a: arm adduction, arm internal rotation, arm flexion, arm extension

o: anterior surface of medial half of clavicle, anterior surface of sternum, costal cartilages of ribs 1-6, anterior layer of rectus sheath

I: crest of greater tubercle of humerus

serratus anterior

a: pulls the scapula forward around the thorax

o: ribs 1-2(intercostal fascia), ribs 3-6, ribs7-9(variably extends to rib 10)

i: along the superior angle, medial border, and inferior angle of the scapula

external intercostals

a: elevate ribs during forced inspiration; supports intercostal spaces and thoracic cage

o: inferior border of ribs

i: superior border of immediate rib below

rectus abdominis

a: move the body between the ribcage and the pelvis

o: pubic symphysis, pubic crest

I: xiphoid process, costal cartilages of ribs 5-7

deltoid

a: arm abduction, which means raising your arm out to the side of your body

o: lateral 1/3 of clavicle, acromion, spine of scapula

i: deltoid tuberosity of humerus

subscapularis

a: internally rotates and adducts the humerus

o: subscapular fossa

i: lesser tubercle of the humerus

gluteus maximus

a: extend the hip

o: the gluteal surface of the ilium

i: superficial fibers to the greater trochanter and a band of the fascia lata and the deep fibers that insert into the gluteal tuberosity between the adductor magus and vastus lateralis

triceps brachii

coracobrachialis

brachialis

\

anconeus

biceps brachii

brachioradialis

supinator

extensor carpi radialis longus

extensor carpi radialis brevis

extensor digitorum

extensor digiti minimi

extensor carpi ulnaris

pronator teres

flexor carpi radialis

palmaris longus

\

flexor digitorum superficialis

flexor carpi ulnaris

pronator quadratus

dorsal interosseous

palmar aponeurosis

abductor pollicis brevis

abductor digiti minimi

biceps femoris

semitendinous

semimembranosus

gracilis

vastus medialis

rectus femoris

vastus lateralis

vastus intermedius

sartorius

ilipsoas

pectineus