Cat Dissection Plan

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  • Topic: Forearm, Ulna, Brachial plexus
  • Pages : 5 (1301 words )
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  • Published : April 2, 2013
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Cat Dissection Plan
Triceps Brachii (three headed arm)-This is a large muscle that extends the entire length of the posterior humerus. It has a long head, lateral head and medial head. The three parts of the muscle converge in a long tendon and intersect in the posterior aspect of the olecranon. Function: Extend the forearm and to adduct and extend the arm. This muscle had three origins, hence “tri”, and is located on the brachium, hence brachii. * Long Head

* Origin: Just inferior to the glenoid fossa of the scapula. * Insertion: Olecranon process of ulna.
* This muscle is superficial and medial in anatomical position. * Arterial Supply: Deep brachial artery
* Nerve Supply: Radial Nerve
* Lateral Head
* Origin: Humeral shaft, lateral side, more proximal.
* Insertion: Olecranon process of ulna.
* This muscle is superficial and lateral in anatomical position. * Arterial Supply: Deep brachial artery
* Nerve Supply: Radial nerve
* Medial Head
* Origin: Humeral shaft, medial side, more distal.
* Insertion: Olecranon Process of ulna.
* This muscle is superficial, but deeper in terms of the other triceps muscles. It is medial in anatomical position and inferior to the long head of the triceps brachii. * Arterial Supply: Deep brachial artery

* Nerve Supply: Radial Nerve
Epitrochlearis - (epi=”on, upon”, trochlearis=a pulley shaped part or structure) Function: Rotates the Ulna.
* Origin: Lateral surface of Latissimus Dorsi
* Insertion: Olecranon Process of the Ulna
* Arterial Supply: Deep brachial artery
* Nerve Supply: Radial Nerve
Biceps Brachii (Bis=twice, brach=arm)
It is a long fusiform muscle of the upper arm. It is on the anterior surface of the humerus, arising in two heads from the scapula. Function: It flexes the arm and the forearm and supinates the hand. This muscle had two origins, hence “bi”, and is located on the brachium, hence brachii. * Long Head

* Origin: Just superior to the glenoid fossa of the scapula. * Insertion: Radial Tuberosity
* This muscle is superficial and lateral in anatomical position. * Arterial Supply: Brachial artery
* Nerve Supply: Musculocutaneous nerve and the brachial plexus * Short Head
* Origin: Coracoid process of the scapula.
* Insertion: Radial Tuberosity
* This muscle is superficial and medial in anatomical position. * Arterial Supply: Brachial artery
* Nerve Supply: Musculocutaneous nerve and the brachial plexus Brachialis A muscle of the upper arm. It covers the distal half of the humerus and the anterior part of the elbow joint. Function: to flex the forearm

* Origin: Distal half of the anterior surface of the humerus. * Insertion: Radial Tuberosity
* This muscle is deep and both lateral and medial. It is on both sides of the distal part of the biceps brachii. * Arterial Supply: Brachial Supply
* Nerve Supply: Musculocutaneous nerve and the brachial plexus; radial nerve

Brachioradialis The most superficial muscle on the muscle on the radial side of the forearm. Function: Flex the forearm
* Origin: The ridge superior to the lateral epicondyle of the humerus. * Insertion: Lateral aspect of the styloid process of the radius. * This muscle is superficial and lateral in anatomical position. * Arterial Supply: Radial recurrent artery

* Nerve Supply: Radial Nerve
Extensor Carpi Radialis Muscle Group (Extendere: to stretch out, karpos: wrist, radius: ray) * Extensor Carpi Radialis Longus one of the seven superficial muscles of the posterior forearm. It inserts into the dorsal surface of the second metacarpal bone. Function: serves to extend the hand and flex the forearm

* Origin: Lateral supracondylar ridge of humerus.
* Insertion: Base of second metacarpal bone.
* This muscle is superficial and lateral in anatomical...
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