Axial Muscles: Actions ONLY Flashcards
Frontalis
Raises eyebrows and wrinkles forehead
Orbicularis Oculi
Closes eyes
Zygomaticus
Raised corner of mouth; smiling muscles
Depressor Anguli Oris
Pulls down corner of mouth; frowning muscle.
Orbicular oris
Purses lips; kissing muscles
Temporalis
Raises jaw;chewing action
Masseter
Raises jaw; chewing action
Buccinator
Holds food between teeth while chewing
Pterygoid
Grinding side to side movements
Suprahyiod Group
(Digastric, stylohyiod, mylohyiod, and heniohyoid)
Widen pharynx, close larynx (pulls hyoid up and toward mandible)
Tensor veli palatini
Close nasal passage by elevating soft palate
Levator veli palatini
Close nasal passage by elevating soft palate
Pharyngeal constrictors
Propel food throught pharynx into esophagus
Infrahyoid (sternohyoid, sternohyoid, omohyoid, thyrohyoid)
Return hyoid and larynx to pre-swallowing position
Sternocleidomastoid
Flexion, lateral movement
Scalene
Lateral movement
Splenius (capitis and cervicus)
Extension
Trapezius
Extension
Erector spinae
Extension; if muscles on both sided of vertebral column contracted- spine and head are erect; if muscles on only one side are contracted- spine if bent laterally.
Quadratus lumboris
Flexion
Internal intercostals
Lower ribs and compress lungs (exhale)
External intercostals
Raise ribs and expand lungs (inhale)
Diaphragm
Contraction-moves down and expands thoracic cavity (inhale); Relaxation-moves up and compress thoracic cavity (exhalation)
Internal oblique
Compresses abdomen; force respiration; some role flexion and rotation of spine.
External oblique
Compresses and abdomen; force respiration; some role flexion and rotation of spine
Transverse abdominus
Compresses abdomen; forced respiration; some role flexion and rotation of spine.
Rectus abdominus
Flexion of spine; sit up muscle
Levator ani & coccygeus
Elevate pelvic floor; prevent increased intraabdominal pressure
External urethral and anal sphincters
Voluntary control urination or defecation
Ischiocavernosus & Bulbospongiosus
Erection of penis or clitoris
