EXS 331 Lab & Exam 3: AN for Muscles of Pectoral Girdle and Shoulder Joint (plus low back)

pectoralis minor

protracts and depresses scapula

-pectoral nerve

subclavius

depresses clavicle

-subclavian nerve

serratus anterior

protracts scapula

-long thoracic nerve

Trapezius

elevates, retracts, and upwardly rotates pectoral girdle

-spinal accessory (C3, C4)

rhomboid major

retracts scapula

-dorsal scapular nerve

rhomboid minor

retracts pectoral girdle, rotates scapula downward

-dorsal scapular nerve

levator scapulae

elevate scapula

-dorsal scapular nerve

deltoid

abduct arm

-axillary nerve

Supraspinatus

abducts arm

-subscapular nerve

Infraspinatus

rotates arm laterally

-suprascapular nerve

subscapularis

medially rotates arm

-subscapular nerve

teres minor

rotates arm laterally

-axillary nerve

teres major

extends, adducts, and medially rotates arm

-subscapular nerve

pectoralis major

Adducts and flexes arm

-pectoral nerve

latissimus dorsi

Extends, adducts, and medially rotates the arm

-thoracodorsal nerve

erector spinae

back extension