November 6 - November 6 2006 ARM BRACHIAL PLEXUS I...

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November 6, 2006 I. Introduction A. Basic terminology 1. upper limb refers to everything from the shoulder out to the finger tips 2. arm – refers just to the humerus and the structures around it 3. forearm – refers to the portion of the upper limb from the elbow through the wrist (& some people will include the hand too) 4. hand – pretty self-evident! B. Function 1. Positioning of the hand is crucial for the quality of life 2. Various forms of grip are also super important. 3. Clinical note : thus, many workman’s compensation cases focus on loss or impairment of movements of the upper limb II. Bones A. Humerus (i.e., the bone in the upper limb between the scapula and the forearm) 1. We already talked about the proximal landmarks in talking about the shoulder 2. Distal features: capitulum, trochlea, medial and lateral epicondyles, olecranon fossa . Condyles on the distal humerus are given different names. B. Ulna (the medial bone of the forearm) 1. Proximal features: trochlear notch, olecranon process (for triceps brachii), coronoid process 2. We’ll talk about distal features next time 3. humerus and ulna come together in a valgus position (i.e., not perfectly straight, with forearm aimed slightly laterally) (clinical ramifications below) C. Radius (the lateral bone of the forearm) (remember in anatomical position! Palm forward.) 1. Proximal features: head, tuberosity (for biceps brachii) III. Elbow Joint – the elbow is technically composed of two parts: the articulation of the ulna with the humerus ( humeroulnar joint), and the articulation of the radius with the humerus ( humeroradial joint) A. Bony articulations: Trochlear notch of ulna articulates with trochlea of humerus, radial head with capitulum of humerus B. Movement: uniaxial , hinge-type movement, with axis running Medial-Lateral 1. shape of trochlear notch and trochlea restricts movement (i.e., no rotation possible at that articulation) 2. while head of radius can spin against capitulum, we’ll talk about that next time as part of
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This note was uploaded on 04/22/2008 for the course BIOLOGY 020.152 taught by Professor Pearlman during the Spring '08 term at Johns Hopkins.

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November 6 - November 6 2006 ARM BRACHIAL PLEXUS I...

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