PTH_AS 2201 Lecture Notes - Lecture 3: Shoulder Girdle, Pelvic Inlet, Olecranon Fossa
27 Apr 2016
School
Department
Course
Professor
Document Summary
Scapulae have no attachment to the axial skeleton. Attached to axial skeleton by muscles and ligaments; provides a highly flexible system (a lot of movement allowed) but not stable; ex. shoulder dislocations. The scapula is located on the dorsal surface of the rib cage. Scapular spine is on the dorsal side of the scapula; perpendicular projection. Glenoid fossa articulates with the humerus (upper arm); forming the shoulder. Coracoid process is the attachment point of the biceps. The acromion articulates with the acromial end of the clavicle. The clavicle (collarbone) extends across the superior thorax. Laterally, the acromial end articulates with acromial process of scapula. Acts as a brace for the scapula and arms. Transmits compression forces from arms to axial skeleton. Mostly straight but has an s-shape to it. The s-shape of the clavicle makes it prone to fracture near the curves. Ligaments around the s-shape are strong, so instead of ligaments dislocating, the bone breaks instead.
