ANAT 100 Lecture Notes - Lecture 3: Splenius Muscles, Externals, Frontal Bone
19 Apr 2018
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Document Summary
Each muscle is a distinct organ composed of skeletal muscle tissue, blood vessels, tendons, and nerves. Muscle tissue acts to move substances throughout the body and can be found in the heart, digestive organs and blood vessels. Types of muscle: smooth: controlled by nervous system or hormones. My either be generally inactive, then respond to stimulation, or may be rhythmic: skeletal: help the human body move. Most skeletal muscle is attached to bones via tendons: cardiac: found in the heart. Contracts rhythmically, modulated by neural activity and hormones. Morphological characterization: smooth: found in blood vessels, the digestive system and other viscera, fusiform-shaped cells with no striations, centrally located nucleus within cell, striated: both light and dark bands in appearance, skeletal. Long muscle fibres: striations, multinucleated cells, peripherally located nucleus within a cell, cardiac. Intercalated discs: striations, centrally located nucleus within cells. Functional characterization: voluntary: consciously controlled in order to perform a specific function, skeletal muscle.
