Lab 5: Anterior Core Muscles

frontalis

orbicularis oculi

what muscle origin: orbital portions of the frontal bone and maxilla

orbicularis oculi

what muscle insertion: skin of the orbital area and eyelids

orbicularis oculi

what muscle action: closes the eye; pulls skin around the eyes

orbicularis oculi

nasalis

levator labii superioris

levator labii superioris alaeque nasii

zygomaticus major

zygomaticus minor

risorius

orbicularis oris

depressor anguli oris

depressor labii inferioris

mentalis

buccinator

which muscle action: pulls the cheeks in, producing sucking

buccinator

which muscle origin: molar regions of maxilla and mandible

buccinator

which muscle insertion: orbicularis oris muscle and CT of cheeks/lips

buccinator

masseter

which muscle action: elevates the mandible

masseter

which muscle origin: zygomatic arch

masseter

which muscle insertion: angle and lateral surfaces of ramus of mandible

masseter

temporalis

omohyoid

sternohyoid

sternocleidomastoid

scalenes

pectoralis major

which muscle action: flexes/adducts the arm; rotates arm medially

pectoralis major

which muscle origin: medial clavicle. sternum, costal cartilages 1-7

pectoralis major

which muscle insertion: greater tubercle and lateral lip of inter-tubercular sulcus of humerus

pectoralis major

pectoralis minor

serratus anterior

which muscle action: moves scapular in protraction; superior rotation of scapula

serratus anterior

which muscle origin: first 9 ribs

serratus anterior

which muscle insertion: medial border of scapula

serratus anterior

external intercostals

which muscle action: elevates rib cage, spreading the ribs, assisting in inspiration

external intercostals

which muscle origin: lower edge of rib superior to its insertion

external intercostals

which muscle insertion: upper edge of rib inferior to its origin

external intercostals

internal intercostals

subscapularis

which muscle action: adducts/rotates humerus medially; stabilizes shoulder joint

subscapularis

which muscle origin: subscapular fossa of scapula

subscapularis

which muscle insertion: lesser tubercle of humerus

subscapularis

rectus abdominis

which muscle action: flexes the trunk; compresses abdominal cavity

rectus abdominis

which muscle origin: superior aspect of pubic bones

rectus abdominis

which muscle insertion: costal cartilages of inferior ribs

rectus abdominis

external oblique

internal oblique

transverse abdominis

psoas major

psoas minor

iliacus

occipitofrontalis (epicranius)