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Anat-Musc Axial Skel

Stack #218724

Semispinalis capitis action extends and rotates head
splenius capitis action extends, rotates, and laterally flexes the head
sternocleidomastoid origin manubrium and clavicle
sternocleidomastiod insertion mastoid process and superior nuchal line occipital bone
sternocleidomastoid action simultaneous contraction of both heads of muscle--> flexion of the head; individual contraction--> rotates and flexes head to opposite side of contracting muscle (prayer muscle)
buccinator action compresses (pulls inward) cheeks (as in whistling and kissing); pushes food between the teeth during mastication; allows you to suck something up a straw; trumpeter muscle
depressor labii inferioris action depresses lower lip (as in frowning and pouting)
levator labii superioris action elevates upper lip (as in sneering or smiling)
occipitofrontalis (frontal belly) action elevates eyebrows, wrinkles skin of forehead, draws scalp anteriorly
orbicularis oculi action closes eye by depressing upper eyelid and elevating lower eyelid
orbicularis oris action closes lip, protrudes and purses lips (as in kissing or whistling)
platysma action depresses mandible, depresses lower lip back and down; tenses the skin of the neck (as in shaving)
zygomaticus action retracts and elevates upper lip and corner of mouth (as in smiling) (2 parts)
temporalis origin temporal lines on parietal and frontal bones
temporalis insertion coronoid process of mandible
temporalis action elevates and retracts mandible for biting and chewing
masseter origin zygomatic arch
masseter insertion lateral side of mandible
masseter action elevates and protracts mandible
digastric origin mastoid process (posterior belly), mandible near midline (anterior belly)
digastric insertion hyoid
digastric action depresses the mandible to open the mouth when hyoid is fixed by other muscles; retracts mandible and elevates hyoid
geniohyoid action protracts and elevates hyoid during swallowing; depresses mandible; helps to open the throat to swallow
mylohyoid action elevates floor of mouth and hyoid (to push food to the back of the throat when swallowing); forms part of the floor of the mouth
iliocostalis action extends and laterally flexes vertebral column
longissimus action extends and laterally flexes vertebral column
spinalis action extends vertebral column
semispinalis action extends neck and vertebral column
interspinales action extends back and neck
multifidus action extends and rotates vertebral column; only moves a few vertebrae (maintenance)
diaphragm action depresses floor of the thoracic cavity for inspiration (increases the volume of the thoracic cavity); responsible for 3/4 of inspired air
external intercostals action elevates ribs for inspiration (swing upwards to expand the thoracic cavity)-- for forced breaths
internal intercostals action depresses ribs for expiration (swing them downwards towards the vertebral column)--for forced breaths
external abdominal oblique action compression of abdomen; flexion and rotation of vertebral column
internal abdominal oblique action compression of abdomen; flexion and rotation of vertebral column
transverse abdominis action compression of abdomen
rectus abdominis action compression of abdomen; flexion of vertebral column
muscles of facial expression fact #1 attach to skin or other muscles
muscles of facial expression #2 used for nonverbal communication
temporalis muscle fiber orientation fibers go downwards at an angle
erector spinae muscles iliocostalis, longissimus spinalis, semispinalis
erector spinae muscles characteristics long, parallel, strap-like muscles running a significant length of the back
inhalation (inspiration) expansion of the lungs and thoracic cavity simultaneously
exhalation (expiration) diaphragm relaxes (dome gets steeper); thoracic cavity and lung volume decreases
sternohyoid action depresses hyoid bone
omohyoid action depresses hyoid bone; fixes hyoid during opening of mouth
Created by: Jean-O