Chapter 10 - Muscular System Flashcards
The study of muscles
Myology
Has distinct banding patterns and sarcomeres
Striated muscle
what kind of control is skeletal muscle ?
Voluntary control
What kind of control is cardiac muscle ?
Involuntary control
Has no distinct banding patterns, all involuntary movement
Smooth muscle
Most smooth muscle is ?
Single unit smooth muscle
Certain locations of smooth muscle ?
Multi unit smooth muscle
2 Types of muscle ?
Striated and Unstriated
Force generated by contracting muscle
Tension
Force exerted on muscle by object (Usually weight)
Load
What kind of muscle is attached to bones across joints ?
Skeletal muscle
what kind of muscle, when contacted or shortened, it generates tension/force
Skeletal muscle
When tension > load, movement of one of the two bones it is attached to occurs
Skeletal muscle
Tension produced, but no change in length of muscle (Tension <= load)
Isometric
Muscle length changes
Isotonic
bundles of highly organized molecules inside muscular fiber
Myofibrils
Muscle cells
Muscle fiber
Bundles of fiber cells
Fascicle
Bundles of fascicles
Muscle
Membrane around muscle fibers
Endomysium
Membrane around fascicles
Perimysium
Membrane around muscle
Epimysium
Muscle that is thick in the middle and thin on the ends
Fusiform
Example of Fusiform
Biceps Brachii
Muscle that has strap-like muscles with parallel fascicles, weaker than fusiform, cover long distances
Parallel
Example of Parallel
Rectus abdominis
Fan shaped with narrow insertion
Triangular
Example of triangular
Pectoralis major
Feather shape to direction of fascicles
Pennate
Form rings around openings, seen in eyes and sphincters
Circular
groups of muscle that work together within one part of the limb
Muscle compartments
Surrounds these large muscle groups, separates it from other nearby muscles
Fascia and tough connective tissue
Contains related muscles and the blood vessels/nerves that supply that muscle group
Fascia and tough connective tissue
Supplies the muscle group that are often contained with the fascia that surrounds the compartment
Artery, vein and nerve
Muscle emerges from bone, no tendon, epimysium continuous with periosteum , eg. intercostal muscles
Direct
attachment via tendon. the tendon is an extension of the epimysium and the tendon merges with periosteum . Most muscles are indirect attachments eg. Bacips brachil
Indirect
Larger portion of the muscle
Belly
The stationary end of a muscle as it contracts and moves
origin
The ending muscle of a muscle as it contracts and moves
Insertion
The end of the muscle that is more proximal and superior without regard for any particular movements or motion of the muscle
Proximal or superior end
The end of the muscle that is more distal and inferior without regard for any particular movements or motion of the muscle
Distal or inferior end
The muscle that does the most work in generating a particular motion
Agonist or prime mover
Elbow flexion, prime mover is ?
Biceps brachii
Muscles that work together to generate a particular motion
Synergistic
Opposing muscles that whose contraction might inhibit the desired motion, these muscles may be relaxed in order to allow the desired motion to occur
Antagonistic
Muscle that must be contracted during a motion that is actually generated by a prime mover in a different area ; without isometric contraction of the fixator, contraction of the prime over will generate a different motion
Fixator
Muscles that are contained within the region they will move
Intrinsic
Muscles that have an origin outside the region they will move
Extrinsic
Nerves stimulate contraction
Skeletal muscle
Initiate and regulate contractions
Smooth muscle
Spontaneous contraction via action of pacemaker cells
Cardiac msucle
12 total, found in head and neck, branch off brain and brainstem
Cranial nerves
30 total ,, branch off spinal cord
Spinal nerves
8 pairs, carries nerves to and from Places
Cervical nerves
Carries nerves to Head, neck, shoulders, arms
Cerical nerves
12 pairs carries nerves to and from the chest, abdominal wall, and arms
Thoracic Nerves
5 pairs, carries nerves to and from th hips and legs
Lumbar
5 pairs , carries nerves to and from the genitals and digestive tract
Sacral
1 pair , carries nerves that goes to and from the anus
coccygeal
muscle shortens (tension > load) eg. lifting something
Concentric
Muscle lengthens (load > tension) eg. putting down something
Eccentric