Muscles and bones function Flashcards
Compresses cheeks
Buccinator
Compresses, purses lips
Orbicularis Oris
Closes eyes
Obicularis oculi
Raises eyebrows and wrinkles for head
Occipitofrontalis frontal belly
Tenses and retracts scalp
Occipital belly
Tenses the skin of neck
depresses mandible
pulls lower lip down
Platysma
Elevate mandible and closes the jaw
Masseter
Elevate mandible
Temporalis
Medial: Elevates the mandible encloses the jars or Slides the mandible from side to side
Lateral:Opens jaw Protrudes mandible or performs lateral excursion
Pterygoids
Depresses mandible or elevates larynx
Digastric
Elevate larynx
Stylohyoid
Together they flex the neck alone one side flexes head toward shoulder and rotates face to opposite side
Sternocleidomastoid
Elevate ribs
External intercostals
Depresses ribs
Internal intercostals
Compresses abdomen depresses ribs Flexes or bends Spine
External oblique
Internal oblique
Contraction expands thoracic cavity and compresses abdominopelvic cavity
Diaphragm
Depresses ribs flexes Vertebral column compresses abdomen
Rectus abdominis
Elevate ribs or flex neck
Scalenes
Closed urethra Compresses prostate and bulbourethral glands
External urethral sphincter
Tenses floor of pelvis Flexes coccygeal joints elevates and retracts anus
Levator Ani lliococcygeus
Closes anal opening
External anal Sphincter
Elevates scapula
Levator Scapulae