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Anatomy Muscles
| Question | Answer |
|---|---|
| Contractility | The ability of skeletal muscle to shorten with force. |
| Excitability | The capacity of skeletal muscle to respond to a stimulus. |
| Extensibility | The ability to be stretched. |
| Elasticity | The ability to recoil to their original resting length after they have been stretched. |
| Epimysium | Connective tissue that surrounds each skeletal muscle. |
| Fascia | Connected tissue located outside the epimysium. |
| Fasicle (fasciculi) | Numerous visible bundles of muscle. |
| Perimysium | Connective tissue that surrounds fasciculi. |
| Muscle cells | Muscle fibers. |
| Endomysium | Surrounds muscle fibers. |
| Myofibrils | A threadlike structure that extends from one end of the fiber to the other. |
| Actin myofilaments | Thin myofilaments. |
| Myosin myofilaments | Thick myofilaments. |
| Sarcomere | Form the myofibril / Basic structural and functional unity of the muscle. |
| Resting Membrane Potential | The charge difference across the membrane. |
| Action Potential | The brief reversal back of the charge. |
| Motor Neurons | Nerve cells that carry action potentials to skeletal muscle fibers. |
| Neuromuscular | Synapse. |
| Motor Unit | A single motor neuron and all the skeletal muscle fibers it innervates. |
| Presynaptic Terminal | The enlarged nerve terminal. |
| Synaptic Cleft | The space between the presynaptic terminal and the muscle cell. |
| Postsynaptic Terminal | The muscle fiber. |
| Synaptic Vesicles | Secretes a neurotransmitter called acetylcholine. |
| Acetylcholine | Neurotransmitter secreted by the synaptic vesicles |
| Mastication | Chewing |
| Occipitofrontalis | Raises eyebrows |
| Orbicularis Oculi | Closes eyelids |
| Orbicularis Oris | Puckers Lips |
| Buccinator | Flattens the cheeks |
| Zygomaticus | Smiling muscle |
| Levator Labii Superoris | Sneering |
| Depressor Anguli Oris | Frowning |
| Intrinsic Tongue Muscles | Change the shape of the tongue |
| Extrinsic Tongue Muscles | Move the tongue |
| Sternocleidomastoid | Lateral neck muscles and prime mover |
| Erector Spinae | Group of muscles on each side of the back |
| Thoracic Muscles | Muscles that move the thorax |
| External Intercostals | Elevate the ribs during inspiration |
| Internal Intercostals | Contract during forced expiration |
| Diaphragm | Accomplishes quiet breathing |
| Trapezius | Rotates scapula |
| Serratus Anterior | Pulls scapula anteriorly |
| Pectoralis Major | Adducts and flexes the arm |
| Lattissimus Dorsi | Medially rotates, adducts, and powerfully extends the arm |
| Deltoid | Attaches the humerus to the scapula and clavicle |
| Triceps Brachii | Extends the forearm |
| Biceps Brachii | Flexes the forearm |
| Brachialis | Flexes forearm |
| Brachioradialis | Flexes and supinates the forearm |
| Flexor Carpi | Flexes the wrist |
| Extensor Carpi | Extends the wrist |
| Flexor Digitorum | Flexes the fingers |
| Extensor Digitoum | Extends the fingers |
| Gluteus Maximus | Buttocks |
| Quadriceps Femoris | Extends the leg |
| Sartorius | Flexes the thigh |
| Hamstring | Posterior thigh muscles |
| Gastocnemius | 1/2 the Calf muscle |
| Soleus | 1/2 the Calf muscle |
| Calcaneal Tendon | Achilles Tendon |
| Number of Muscles Located in the Foot | 20 |
| Muscle Twitch | A contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers. |
| Threshold | The point in which the muscle fiber will contract maximally |
| Lag Phase | The time between application of a stimulus to a motor neuron and the beginning of a contraction |
| Contraction Phase | The time of contraction |
| Relaxation Phase | The time in which the muscle relaxes |
| Tetany | Where the muscle remains contracted without relaxing |
| Recruitment | The increase in number of motor units being activated |
| Muscle Tone | The constant tension produced by muscles of the body for a long period of time. |
| Fast-twitch Fibers | Contract quickly and fatigue quickly |
| Slow-twitch Fibers | Contract slowly and are more resistant to fatigue |
| Origin | The most stationary part of the muscle |
| Insertion | The end of a muscle that undergoes the most movement |
| Belly | Lies between the origin and the insertion |
| Prime Mover | One muscle that plays a key role in movement. |
Created by:
FlyingEagle20
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