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Muscular system
302.3 Vet nursing Muscular System
Question | Answer |
---|---|
3 types of muscle in the body? | skeletal, smooth and cardiac muscle |
what is skeletal muscle? | also called striated muscle. allows the skeleton to move. under voluntary control. |
what is smooth muscle? | also called non-striated muscle. found in the guts, uterus, bladder, blood vessels, airways and eyes. under involuntary control |
what is cardiac muscle? | involuntary striated muscle. found in the heart. never gets tired. |
what is the name of a muscle cell? | muscle fibre |
describe muscle fibres | very large, multi-nucleated and up to several millimetres in length |
what are muscle fibres made from? | long strands of contractile proteins called myofibrils |
myofibrils are divided into sections called what? | sacromeres |
each sacromere is made from 2 proteins called? | myosin (thick) actin (thin) |
The process of muscle contraction requires what as a source of energy? | ATP |
What does ATP stand for? | Adenosinetriphosphate |
What ion is essential to the process of muscle contraction? | Calcium |
What is the origin of a muscle? | Proximal attachment to the skeleton |
What is the belly of a muscle? | Main part of the muscle |
What is the insertion of a muscle? | Distal attachment to the skeleton |
What is the tendon of a muscle? | Fibrous connective tissue connecting muscle to bone |
What is the bursa of a muscle? | Protective cushion between tendon and bone. Fluid filled sac. |
What is the synovial sheath of a muscle? | Connective tissue layer which surrounds the tendon |
What is an aponeurosis of a muscle? | A sheet of fibrous tissue that takes the place of a tendon in flat muscles (such as abdomen) |
What is a sphincter muscle? | A circular ring of muscles |
3 muscles of mastication? | Temporalis, Masseter, Digastricus |
3 types of eye muscle? | Rectus, oblique and retractor bulbi muscles |
How many rectus muscles in the eye and what are they for? | 4, for moving eye left, right, up and down |
How many oblique muscles in the eye and what are they for? | 2, for rotating eye clockwise and counter-clockwise |
Where is the retractor bulbi in the eye and what is it for? | Around optic nerve at the back of the eye, for pulling the eye deeper into the skull |
2 muscles of the vertebral column | Epaxial (above) and Hypaxial (below) muscles |
2 muscles of the thorax? | internal intercostal and external intercostal |
3 openings in the diaphragm? | aortic hiatus, oesophageal hiatus, caval foramen |
4 muscles of the abdominal wall? | External abdominal oblique, Internal abdominal oblique, Transverse abdominis, Rectus abdominis |
What is the linea alba? | White line down the middle of the abdomen where all the aponeuroses of the lateral abdominal muscles meet |
What is the Trapezius muscle and what does it do? | Triangular shaped muscle that draws the leg forward |
What is the Latissmus dorsi muscle and what does it do? | Large fan shaped muscle that retracts the forelimb |
What is the Brachiocephalicus muscle and what does it do? | Runs from the base of the skull to the humerus. Flexes neck and protracts the limb |
What is the Supraspinatus muscle and what does it do? | Fills the supraspinous fossa of the scapula. Extends shoulder joint |
What is the Infraspinatus muscle and what does it do? | Fills the infraspinous fossa of the scapula. Flexes the shoulder joint |
What is the Triceps brachii muscle and what does it do? | Four headed muscle behind the humerus. Extends elbow joint |
What is the Biceps brachii muscle and what does it do? | Flexes the elbow joint. |
What is the Brachialis muscle and what does it do? | Front of the humerus. Flexes elbow joint. |
What are the Gluteal muscles and what do they do? | Superficial, deep and middle gluteals for the curve of the rump. Extend hip joint |
What are the Hamstring muscles and what do they do? | Biceps femoris, semitendinosus and semimembranosus which form the caudal thigh. Extend hip and flex stifle joint. |
What is the Quadriceps femoris muscle and what does it do? | Large muscle of cranial thigh. Extends stifle joint. Tendon contains patella |
What is the Gastrocnemius muscle and what does it do? | Muscle of lower hind-limb. Attached to calcaneus of hock. Extends hock and flexes stifle |
What is the Achilles tendon and what does it do? | Large strong tendon along back of the leg. Made from superficial digital flexor, gastrocnemius, biceps femoris and semitendinosus. |
What are the limbs of the horse adapted for? | Speed |
There is little or no what below the knee and hock? | Muscle |
What is the purpose of a tendon? | Attach muscle to bone |
4 important tendons in the horses lower leg? | Deep digital flexor, Superficial digital flexor, Common digital extensor, Lateral digital extensor |
Do horses sleep standing up or lying down? | Standing up |
What is the "stay apparatus" in a horse? | Allows them to lock their legs and stand still for a long time |
Why have horses developed a stay apparatus? | to be able to flee from predators at short notice |