Muscle Directory

Check this page often as the database will grow as I am able to edit it

Biceps Brachialis
Actions:

long head:
abducts and rotates humerus medially

both heads:
shoulder flexion
elbow flexion
elbow supination
 
Innervation:

musculocutaneous nerve (C5-C6)
Deltoid
Actions: 

anterior:
shoulder abduction
shoulder flexion
transverse shoulder flexion
shoulder internal rotation

lateral:
shoulder abduction
shoulder flexion
transverse shoulder flexion

posterior:
shoulder extension
transverse shoulder extension
transverse shoulder abduction
shoulder external rotation


Innervations:


Axillary Nerve (C4-C6)
pectoral branches (C4-C5)
Infraspinatus
Actions:



shoulder external rotation


Innervations:
suprascapular nerve (C4-C6)
Latissimus Dorsi
Actions:


shoulder adduction
shoulder extension
shoulder medial rotation

Innervations:


thoracodorsal nerve (C6-C8)
Pectoralis Major

Actions:


shoulder abduction
shoulder adduction (upper fibres)
transverse shoulder abduction
shoulder internal rotation
shoulder flexion (upper fibres)
transverse shoulder flexion
shoulder extension (mid/lower fibres)

Innervations:
pectoral nerves (C5-T1)
Pectoralis Minor
Actions:


scapular depression
downward scapular rotation

Innervations:


pectoral nerves (C6-C8)
Serratus Anterior

Actions:


scapular protraction
hold scapula on thorax
upward scapular rotation

Innervations:


long thoracic nerve (C5-C7)
Subscapularis

Actions:


shoulder internal rotation

Innervations:


subscapular nerve (C5-C8)
Supraspinatus

Actions:


shoulder abduction
stabilizes humerus in socket

Innervations:


suprascapular nerve (C4-C6)
Teres Major
Actions:


shoulder extension
shoulder adduction
shoulder external rotation

Innervations:

thoracodorsal nerve (C6-C7)
Teres Minor
Actions:


shoulder external rotation (weak)

Innervations:


axillary nerve (C5-C6)
Triceps Brachii
Actions:

long head: retroversion and adduction of humerus

all heads:extend elbow

Innervations:
radial nerve (C6-C8)