Muscles for Practical Flashcards
(46 cards)

Trapezius
Innervation: spinal accesory nerve (CNXI)
Action:
- Descending part elevates
- Ascending part depresses
- Middle part retracts

Rhomboid Major
Innervation: dorsal scapular nerve
Action: retract scapula, fix scapula to thoracic wall

Rhomboid minor
Innervation: dorsal scapular nerve
Action: retract scapula, fix scapula to thoracic wall

Levator scapulae
Innervation: dorsal scapular nerve
Action: elevate scapula

Deltoid
Innervation: axillary nerve
Action:
- Anterior part flexes arm
- Middle part abducts arm
- Posterior part extends arm

Teres major
Innervation: lower subscapular nerve
Action: adducts and medially rotates arm

Tricaps brachii
Innervation: radial nerve
Action: cheif extensor of forearm

Teres minor
Innervation: axillary nerve
Action: laterally rotates arm

Supraspinatus
Innervation: suprascapular nerve
Action: assists deltoid with abduction of arm

Infraspinatus
Innervation: suprascapular nerve
Action: laterally rotates arm

Subscapularis
Innervation:
- Upper subscapular nerve
- Lower sucscapular nerve
Action: medially rotates arm

Pectoralis major
Innervation:
- Lateral pectoral nerve
- Medial mectoral nerve
Action: adducts and medially rotates humerous

Pectoralis minor
Innervation: medial pectoral nerve
Action: stabalizes scapula by drawing it inferiorly and anteriorly against thoracic wall

Serratus anterior
Innervation: long thoracic nerve
Action: protracts scapula and holds it against thoracic wall and rotates scapula

Sternocleidomastoid
Innervation: accessory nerve (CN XI)
Action:
- Unilateral contraction causes lateral flexion
- Bilateral contraction causes elevation of head

Inferior belly of the omohyoid muscle
Innervation: cervical plexus (ansa cervicalis)
Action: depresses hyoid bone

Anterior, middle, and posterior scalene muscles

Coracobrachialis
Innervation: musculocutaneous nerve
Action: helps flex and adduct arm (resists dislocation of shoulder)

Biceps brachii
Innervation: musculocutaneous nerve
Action: supinates and flexes forearm

Brachialis
Innervation: musculocutaneous and radial nerves
Action: flexes forearm

Brachioradialis
Innervation: radial nerve
Action: flexion of forearm (weak)

Supinator
Innervation: radial nerve
Action: supinates forearm

Pronator teres
Innervation: median nerve
Action: pronates and flexes forearm (at elbow)

Flexor carpi ulnaris
Innervation: ulnar nerve
Action: flexes and adducts hand (at wrist)




















