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51 Cards in this Set
- Front
- Back
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the anterior compartment of the arm houses mainly what type of muscle and what innervation?
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the anterior compartment has preaxial muscles, indicating flexors and adductors, and the main innervation is done by C6 spinal nerve, all from the musculocutaneous.
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What are the muscles in the anterior compartment of the arm?
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Biceps Brachii
Brachialis Coracobrachialis |
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the posterior compartment of the arm houses mainly what type of muscle and what innervation?
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the posterior compartment houses postaxial muscles which indicated ABductor and extensor muscles, and the main innervation is from C7, both from the radial nerve.
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What are the muscles in the posterior compartment of the arm?
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Triceps brachii
Anconeus |
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This picture demonstrates the relationship between muscle compartments and their main innervations using a preaxial/postaxial categorization.
Name the nerve for each muscle group and its main spinal nerve contribution. |
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What pierces the coracobrachialis muscle?
What is the coracobrachialis muscle innervated by? |
Musculocutaneous - C6
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what do the biceps do when the elbow is flexed?
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when supinated,flex elbow,
when pronated, it becomes the most powerful supinator |
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What do the biceps do when the arm is extended?
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simple forarm flexor
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what is the most powerful forearm flexor?
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brachialis
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what does the coracobrachialis do?
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help flex the arm, adducts the arm, major stabilizer, (so humerus doesnt fall out)
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reflex hammer on the opposite side of the elbow tests what spinal nerve?
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C6, of the musculocutaneous
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what are the main actions of the triceps brachii?
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Main Actions
Forearm extensor Can also adduct the arm Long head resists humoral dislocation |
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What abducts the ulna during pronation?
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anconeus
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Where is the anconeus?
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Origin – Lateral epicondyle of humerus
Insertion – Lateral surface of olecranon and superior aspect of posterior ulna |
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What does the anconeus do?
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Slight forearm extensor
Elbow stabilizer Abducts ulna during pronation |
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WHat would an injury to the radial nerve in the radial groove cause?
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Injury to the radial nerve in the radial groove results in partial triceps paralysis because only the medial head is affected. However, the extensor muscles supplied by the nerve distally will be paralyzed.
This effect is seen clinically as “wrist drop” because of the unopposed tonus of the flexor muscles. |
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What is "wrist drop" a sign of?
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Injury to the radial nerve in the radial groove results in partial triceps paralysis because only the medial head is affected. However, the extensor muscles supplied by the nerve distally will be paralyzed.
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Both deep and superficial veins ultimately drain into the ____ vein near the root of the neck
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subclavian
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Venipuncture is usually accomplished in the _____ _____ vein overlying the cubital fossa
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median cubital
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The Trapezius muscle 1.) has what function? 2.) is innervated by which nerve? And 3.) Has which roots?
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1.) Elevates shoulder/arm, fixes scapula 2.) Spinal Accesory 3.) CN XI, C3, C4
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The Diaphragm muscle 1.) has what function? 2.) is innervated by which nerve? And 3.) Has which roots?
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1.) Inspiration 2.) Phrenic 3.) C345
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The Rhomboids muscle 1.) has what function? 2.) is innervated by which nerve? And 3.) Has which roots?
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1.) Draw scapula up and in. 2.) Dorsal Scapular 3.) C456
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The Levator Scapulae muscle 1.) has what function? 2.) is innervated by which nerve? And 3.) Has which roots?
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1.) Elevates scapula 2.) Dorsal Scapular 3.) C345
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The Serratus Anterior muscle 1.) has what function? 2.) is innervated by which nerve? And 3.) Has which roots?
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1.) Fixes scapula on arm raise (part of winged scapula if cut) 2.) Long thoracic 3.) C567
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The Pectoralis major (clavicular head) muscle 1.) has what function? 2.) is innervated by which nerve? And 3.) Has which roots?
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1.) Pulls shoulder forward 2.) Lateral Pectoral 3.) C56
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The Pectoralis major (sternal head) muscle 1.) has what function? 2.) is innervated by which nerve? And 3.) Has which roots?
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1.) Adducts and medially rotates arm 2.) Medial pectoral 3.) C678,T1
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The Pectoralis minor muscle 1.) has what function? 2.) is innervated by which nerve? And 3.) Has which roots?
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1.) Depresses scapula and pulls shoulder forward 2.) Medial pectoral 3.) C678
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The Supraspinatus muscle 1.) has what function? 2.) is innervated by which nerve? And 3.) Has which roots?
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1.) Abducts humerus from 0 deg to 15 deg. 2.) Suprascapular 3.) C56
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The Infraspinatus muscle 1.) has what function? 2.) is innervated by which nerve? And 3.) Has which roots?
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1.) Externally rotates humerus 2.) Suprascapular 3.) C56
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The Subscapularis muscle 1.) has what function? 2.) is innervated by which nerve? And 3.) Has which roots?
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1.) Internally rotates humerus 2.) Subscapular 3.) C56
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The Teres Major muscle 1.) has what function? 2.) is innervated by which nerve? And 3.) Has which roots?
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1.) Adducts and internally rotates humerus 2.) Subscapular 3.) C567
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The Lat Dorsi muscle 1.) has what function? 2.) is innervated by which nerve? And 3.) Has which roots?
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1.) Adducts and internally rotates humerus 2.) Thoracodorsal 3.) C678
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The Teres minor muscle 1.) has what function? 2.) is innervated by which nerve? And 3.) Has which roots?
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1.) Adducts and internally rotates humerus 2.) Axillary 3.) C56
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The Deltoid muscle 1.) has what function? 2.) is innervated by which nerve? And 3.) Has which roots?
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1.) Abducts humerus beyond 15 deg 2.) Axillary 3.) C56
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The Axillary nerve feeds which muscle(s)?
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Teres minor and Deltoid
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The Dorsal Scapular nerve feeds which muscle(s)?
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Rhomboids and Levator Scapulae
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The Lateral Pectoral nerve feeds which muscle(s)?
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Pectoralis major (clavicular head)
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The Long thoracic nerve feeds which muscle(s)?
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Serratus Anterior
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The Medial pectoral nerve feeds which muscle(s)?
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Pectoralis major (sternal head) and Pectoralis minor
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The Phrenic nerve feeds which muscle(s)?
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Diaphragm
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The Spinal Accesory nerve feeds which muscle(s)?
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Trapezius
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The Subscapular nerve feeds which muscle(s)?
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Subscapularis and Teres Major
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The Suprascapular nerve feeds which muscle(s)?
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Supraspinatus and Infraspinatus
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The Thoracodorsal nerve feeds which muscle(s)?
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Lat Dorsi
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