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skeleton-outline - Skeletal System page 1 of 5 ANAT 11110...

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Skeletal System page 1 of 5 ANAT 11110 Lectures 18, 19, 20, & 21 Fall 2011 The Skeletal System I. Organization A. Components of the skeletal system: bones + joints B. The word bone 1. Bone, the connective tissue (i.e., bony connective tissue): matrix composed of collagen fibers and hydroxyapatite ground substance a. Collagen: gives strength under tensile forces b. Hydroxyapatite: inorganic mineral substance (containing calcium), giving strength under compressive forces 2. Bone, the organ: composed primarily of bony connective tissue + other types of connective tissue, as well as nervous and epithelial elements II. Function of the skeletal system A. Provides structure, support, and protection B. Essential for locomotion and movement C. Site of blood cell formation (i.e., hematopoiesis) D. Storehouse for some inorganic minerals, especially calcium E. Indicator of sex, age, height, weight, geographic ancestry, and (to some extent) medical history III. Macroscopic structure of a bone A. Diaphysis: bone shaft; primary center of ossification B. Epiphysis: often associated with area of articulation with another bone or site of strong muscle attachment; secondary center of ossification
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Skeletal System page 2 of 5 C. Epiphyseal plate (aka, disk): connecting diaphysis and epiphysis; composed of hyaline cartilage D. Periosteum and endosteum: membranes covering outer and inner bone surfaces, respectively E. Medullary cavity (aka, marrow cavity): cavity at the center of a long bone F.
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