Anatomy--Chapter 6b

where is the frontalis

forehead

frontalis origin

cranial aponeurosis

frontalis insertion

skin of eyebrows

frontalis action

raises the eyebrows and wrinkles the forehead

where is the obicularis oculi

eye

obicularis oculi origin

frontal bone and maxilla

obicularis oculi insertion

tissue around eyelids

obicularis oculi action

closes, squints, blinks, and winks the eye

where is the obicularis oris

mouth

obicularis oris origin

mandible and maxilla

obicularis oris insertion

skin and muscle around the mouth and lips

obicularis oris action

closes the mouth and protrudes the lips

where is the buccinator

cheek

buccinator origin

maxilla and mandible near the molars

buccinator insertion

obicularis oris

buccinator action

compresses the cheek while sucking/ whistling, holds food between teeth while chewing

where is the zygomaticus

cheek

zygomaticus origin

zygomatic bone

zygomaticus insertion

skin and muscle at the corner of the lips

zygomaticus action

raises the corner of the mouth and allows you to smile

where is the masseter

jaw

masseter origin

temporal bone

masseter insertion

mandible

masseter action

closes jaw at the corner of the mouth (lower jaw)

where is the temporalis

temple, on side of head

temporalis origin

temporal bone

temporalis insertion

mandible

temporalis action

closes the jaw at the top of the head

where is the platysma

neck

platysma origin

connective tissue covering of the superior chest muscles

platysma insertion

tissue around the mouth

platysma action

pulls the corners of the mouth inferiorly, allows you to frown

where is the sternocleidomastoid

neck (deep to the platysma)

sternocleidomastoid origin

sternum and clavicle

sternocleidomastoid insertion

mastoid process of temporal bone

sternocleidomastoid action

flexes the neck and rotates the head

where is the pectoralis major

chest

pectoralis major origin

sternum, clavicle, and 1-6 ribs

pectoralis major insertion

proximal anterior humerus

pectoralis major action

adducts and flexes the humerus

where is the external intercostals

ribs

external intercostals origin

ribs

external intercostals insertion

ribs

external intercostals action

raises rib cage during INHALATION

where is the internal intercostals

ribs

internal intercostals origin

ribs

internal intercostals insertion

ribs

internal intercostals action

depresses rib cage and moves air out of lungs during EXHALATION

where is the rectus abdominis

abdomen

rectus abdominis origin

pubis

rectus abdominis insertion

sternum and 5-7 ribs

rectus abdominis action

flexes vertebral column

where is the external/internal oblique

outer abdomen, side of abs

external/internal oblique origin

lower 8 ribs

external/internal oblique insertion

iliac crest, linea alba

external/internal oblique action

flexes and rotates vertebral column

where is the transversus abdominis

abdomen (under the obliques)

transversus abdominis origin

iliac crest and connective tissue of abdomen

transversus abdominis insertion

linea alba, pubis, xiphoid process of sternum

transversus abdominis action

compresses the abdomen

where is the trapezius

back/neck/shoulder

trapezius origin

occipital bone and all cervical and thoracic vertebrae

trapezius insertion

scapular spine and clavicle

trapezius action

extends the neck and adducts the scapula

where is the latissimus dorsi

back

latissimus dorsi origin

sacral, lumbar, and lower thoracic spine and iliac crest

latissimus dorsi insertion

proximal humerus (interbercular groove)

latissimus dorsi action

extends and adducts the humerus

where is the erector spinae

back (near spine)

erector spinae origin

iliac crest, 3-12 ribs, and vertebrae

erector spinae insertion

ribs, thoracic and cervical vertebrae

erector spinae action

back extension

what are the 3 paired muscles that make up the group of erector spinae

iliocostalis (most outside), longissimus (middle), spinalis (closest to the spine)

where is the quadratus lumborum

back (near spine)

quadratus lumborum origin

iliac crest, lower 3 lumbar vertebrae, lumbar fascia

quadratus lumborum insertion

transverse process of upper lumbar vertebrae, floating ribs

quadratus lumborum action

flexes the spine laterally, extends the spine

where is the deltoid

shoulder

deltoid origin

scapular spine and clavicle

deltoid insertion

deltoid tuberosity

deltoid action

abducts the humerus

where is the biceps brachii

anterior arm

biceps brachii origin

glenoid fossa and coracoid process of scapula

biceps brachii insertion

radial tuberosity

biceps brachii action

flexes the elbow and supinates the forearm

where is the brachialis

arm

brachialis origin

distal anterior humerus

brachialis insertion

coronoid process of proxima ulna

brachialis action

flexes the elbow

where is the brachioradialis

forearm

brachioradialis origin

lateral distal humerus

brachioradialis insertion

proximal to the styloid process of the radius

brachioradialis action

flexes the elbow

where is the triceps brachii

posterior arm

triceps brachii origin

proximal posterior humerus and posterior lateral scapula

triceps brachii insertion

olecranon process of ulna

triceps brachii action

extends the elbow

where is the flexor carpi radialis

anterior forearm

flexor carpi radialis origin

medial epicondyle of humerus

flexor carpi radialis insertion

2 and 3 metacarpals