KINESIOL 2E03 Lecture Notes - Lecture 10: Radial Tuberosity, Bicipital Groove, Radial Fossa
21 Sep 2016
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Document Summary
Greater tuberosity starts on backside wraps around to front side. Deltoid tuberosity roughened area halfway down humerus on lateral side (on shaft) Radial groove upper medial to down and lateral: split for two heads of triceps, radial nerve follows down it. Anatomical neck slight tapering right below the head. Surgical neck point in the humerus that"s most easy to fracture because it"s more tapered, smallest csa. Not highly congruent humeral head is 3x the size of the articular surface of glenoid fossa: almost zero stability from a bony perspective. Facilitates mobility due to minimal stability; large range of motion. Negative intra-articular pressure draws itself closed with the small amount of fluid in the joint: once separated/dislocated, you lose the negative pressure injury can reoccur. Glenoid labrum fibrocartilaginous lip that projects out, similar to a meniscus. Suction cup around periphery that helps hold on to the humerus better. Lip deepens the socket functionally, improves / increases the contact area.
