Term
| What are the muscles of the arm divided into? |
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Definition
-anterior arm muscles=flexors
-posterior arm muscles=extensors |
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Term
| What are the anterior muscles of the arm? |
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Definition
1. biceps brachii
2. brachialis
3. brachioradialis |
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Term
| What are characteristics of the biceps brachii? |
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Definition
-2 heads: short (medial) and long (lateral)
-acts on 3 joints: shoulder (ball & socket), elbow (hinge), and forearm (pivot) |
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Term
| What is the origin and insertion of the biceps brachii? |
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Definition
O: short head=coracoid process
long head=supraglenoid tubercle
I: bicipital tuberosity via bicipital aponerurosis |
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Term
| What are the actions and innervation of the biceps brachii? |
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Definition
A: elbow flexion, forearm supination, shoulder flexion
N: median nerve |
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Term
| What are characteristics of the brachialis? |
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Definition
-most powerful of the elbow flexors
-flat muscle deep to biceps brachii on anterior arm |
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Term
| What is the origin and insertion of the brachialis? |
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Definition
O: anterior humerus
I: coranoid process of ulna |
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Term
| What are the actions and innervation of the brachialis? |
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Definition
A: elbow flexion
N: musculotaneous nerve |
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Term
| What are characteristics of the brachioradialis? |
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Definition
-runs the length of the forearm
-part of elbow flexor group
-may be considered a posterior arm muscle |
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Term
| What is the origin and insertion of the brachioradialis? |
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Definition
O: distal lateral humerus
I: radial styloid process |
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Term
| What are the actions and innervation of the brachioradialis? |
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Definition
A: elbow flexion
N: radial nerve |
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Term
| What are the posterior muscles of the arm? |
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Definition
1. triceps brachii
2. anconeous |
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Term
| What are characteristics of the triceps brachii? |
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Definition
-3 heads
-long head crosses shoulder so there is action there too |
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Term
| What is the origin and insertion of the triceps brachii? |
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Definition
O: medial and lateral heads=posterior humerus
long head=infraglenoid tubercle
I: olecranon process of ulna |
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Term
| What are the actions and innervation of the triceps brachii? |
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Definition
A: elbow extension; long head adducts shoulder
N: radial nerve |
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Term
| What is the triangular space? |
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Definition
-space formed by the teres minor, teres major, and long head of the triceps
-contains blood vessels which nourish the proximal humerus |
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Term
| What is the quadrangular space? |
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Definition
-formed by teres minor, teres major, and long and lateral heads of the triceps
-contains the axillary nerve |
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Term
| What is the triangular interval? |
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Definition
-formed by the teres majo, long, and lateral head of the triceps
-contains the radial nerve |
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Term
| What are characteristics of the anconeous? |
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Definition
-small, triangular shaped muscle on posterior side of elbow
-synergist to triceps brachii |
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Term
| What is the origin and insertion of the anconeous? |
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Definition
O: lateral epicondyle
I: olecranon process |
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Term
| What are the actions and innervation of the anconeous? |
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Definition
A: "locks" elbow extension
N: radial nerve |
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