Gateway prep: HHSC 1550 Anatomy and Physiology I

Pectoralis major

Action: adduct, flex & medially rotate shoulder

Origin: Clavicle, sternum, costal cartilage 1-7

Insertion: humerus: intertubercular groove

Latissimus dorsi

Action: extend, adduct & medially rotate shoulder

Origin: posterior iliac crest, T7-L5 spinous process

Insersion: humerus: intertubercular groove

Deltoid Anterior

Action: flex/medially rotate shoulder

Origin: clavicle and scapula: acromion and spine

Insertion: humerus deltoid tuberosity

Deltoid Lateral

Action: lateral: abduct shoulder

Origin: clavicle and scapula: acromion and spine

Insertion: humerus: deltoid tuberosity

Deltoid Posterior

Action: extend and laterally rotate shoulder

Origin: clavicle and scapula: acromion and spine

Insertion: humerus: deltoid tuberosity

Coracobrachialis

Action: flex shoulder

Origin: scapula: coracoid process

insertion: humerus: medial aspect mid-shaft

Teres Major

Action: Adduct/medially rotate shoulder

Origin: Scapula: inferior angle

Insertion: Humerus: intertubercular groove

Supra spinatus

Action: abduct shoulder

Origin: supraspinous fossa

INsertion: greater tubercle (humerus)

Infraspinatus

Action: adduct/laterally rotate shoulder

Origin: scapula:infraspinous fossa

Insertion: humerus:greater tubercle

Teres minor

Action: abduct/laterally rotate shoulder

Origin: scapula: lateral border

Insertion: humerus: greater tubercle

Subscapularis

Action: adduct/medially roate shoulder

Origin: subscapular fossa

Insertion: humerus:lesser tubercle

Frontalis

Action: elevate eyebrows

Origin: aponeurosis of scalp

Insertion: eyebrow skin

Occipitalis

Action: pull scalp posteriorly

Origin: occipital/temporal bones

Insertion: aponeurosis of scalp

Orbicularis oculi

close eyeOrbi

orbicularis oris

purse lips

Zygomaticus major

Action: elevate corner of mouth

Origin: temporal process

Insertion: upper corner of mouth

Buccinator

Action: compress cheek

Origin: maxilla and mandible molar regions

Insertion: Orbicularis oris

Temporalis

Action: elevate mandible

Origin: temporal lines

Insertion: mandible cornoid process and ramus

Masseter

Action: elevate mandible

Origin: zygomatic arch

Insertion: mandible: ramus/angleP

Platysma

Action: tense neck, depress lower lip

Origin: fascia of chest (deltoid/pect.major)

Insertion: mandible lower edge, skin of lower face