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BMS 301 Lecture Notes - Bicipital Groove, Aponeurosis, Deep Artery Of Arm

3 pages36 viewsFall 2012

Biomedical Science
Course Code
BMS 301
Mark Frasier

of 3
28 November
Elbow region
Composite joint – 3 articulations
Common joint capsule
Make up “true” elbow joint
Trochlea of humerus and trochlear notch of ulna
Capitulum of humerus and head of radius
Head of radius and radial notch of ulna
True elbow joint
Humerus with radius and ulna
Synovial, uniaxial, hinge
Allows flexion and extension
Strong collateral ligaments prevent abduction or adduction
Ulnar on medial side
Radial on lateral side
“Carrying” angle – in anatomical position, forearms point outward
“Tennis elbow” – lateral epicondylitis
Inflammation of tendons at lateral epicondyle of humerus
Ulnar nerve passes posterior to medial epicondyle of humerus
Hitting – funny bone
Supinate – palm up
Pronate – palm down, bones crossed
Radioulnar joints
Proximal and distal
Both synovial, uniaxial, rotational or pivotal
Radius is spinning, ulna stays still
Radius is attached to carpal bones, they move with it
Movement is pronation and supination
Radius and ulna held together by Interosseus membrane (ligament)
Energy moves up radius from hand, tightens Interosseus membrane, energy
transfer to ulna, on to humerus
Annular ligament
Runs around head of radius without attaching to it
Attached to posterior ulna, runs around radius, attached to anterior ulna
Muscles of the arm
Action at shoulder and/or elbow
Anterior and posterior group
Anterior – flexors, musculocutaneous nerve
Posterior – extensors, radial nerve
Anterior group
Elbow flexion (1°)
Flex shoulder, adduct shoulder
Biceps brachii
Long head runs through bicipital groove, attaches at supraglenoid tubercle
Flex shoulder
Short head runs to coracoid process
Flex shoulder
Together at elbow attach at radial tuberosity, flex elbow
At elbow – bicipital aponeuroses
Protective of deeper structures
Additional attachment of biceps brachii
Most powerful supinator
Posterior group
Long head crosses shoulder
Extends shoulder
Runs to infraglenoid tubercle
Lateral head
Medial head
All 3 insert on olecranon process of ulna
Elbow extensors
Axillary nerve emerges between long and lateral head
Cut lateral head – medial head exposed
Right against bone
Radial nerve and deep brachial artery lie between lateral and medial head

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