Muscles Practical 1 Flashcards
Sternocleidomastoid
Flexes, rotates, and laterally flexes head and neck
Splenius capita
Extends/hyperextends head
Scalene a
Elevates rib cage
Trapezius
Elevates scapula; depresses scapula; retracts scapula; rotates scapula up
Origin: occipital region and spines of C2-T12
Insertion: scapular spine, acromion, clavicle
Masseter
Elevates mandible; protrudes mandible
Temporalis
Elevates mandible; retracts mandible
Frontal is
Elevates eyebrows
Occipitalis
Pulls scalp posteriorly
Auriculars
Moves ears
Natalia
Widens nostrils; depresses/compresses nasal cartilage
Orbicularis oculi
Closes eyelid
Orbicularis oris
Compresses lips; everts lips
Levator labii superioris
Elevates upper lip; everts upper lip
Depressor labii
Depresses lower lip
Depressor anguli
Depresses angle of lips
Mentalis
Protrudes lower lip
Zygomaticus
Elevates upper lip
Risorius
Draws lips laterally
Buccinator
Compresses cheeks
Latissimus dorsi
Abducts shoulder; extends shoulder; medially rotates shoulder
Origin: lower vertebral column and iliac crest
Insertion: anterior lesser tubercle of humerus
External intercostals
Expands ribcage
Internal intercostals
Compress ribcage
Diaphragm
Increase thoracic volume
Rectus abdominis
Flexes lumbar vertebrae and compresses abdomen
