Lab Exam 4 Flashcards
Function of epicranius? (frontal & occipital belly)
Lift eyebrows and forehead wrinkles
Where dose the temporalis originate and insert?
ORGIN: parietal bone INSERT: coronoid process
Function of obicularis oculi? and oris
Close your eye tight
ORIS: pucker lips
What happens to the neck when you turn your neck to the LEFT?
When you turn your head to the left, the right strenocleidomastoid is contracting and the left splenius capitis is working.
What is are some antagonist muscles?
Masseter is antagonist to platysma. Biceps brachii(flex arm) is antagonist to triceps brachii(extend arm). Extensor carpi ulnaris is antagonist to flexor carpi ulnaris.
Where dose biceps brachii originate and insert? and FUNCTION
FLEX elbow! ORGIN: coracoid process and glenoid fossa INSERT: radial tuberosity
Which muscles or synegist?
Flexor carpi radialis is synegist to flexor carpi unaris. Temporalis is synegist to masseter(both elevate mandible). external oblique is synegist to rectus adominus(both flex truck).
Which muscles are multinucleated?
Only skeletal! the rest are mono-nucleated
Where dose the triceps brachii originate and insert? and function
extendthe elbow ORGIN: lateral calavicle and spine of scapula INSERT: olocreon process
2 largest back muscles
Latissimus dorsi(ABDUCT humerus) and trapezius (stabilize and move scapula)
define flexion
decreasing a joint angle
define extension
increasing a joint angle
define abductor
away from the midline
define adductor
towards the midline
define origin and insertion
ORIGIN- anchors the bone(no movement) INSERT- the site where bone and muscle are attached and move during contraction
subscapularis, infraspinatus, teres minor, supraspinatus are what?
4 muscles of the rotator cuff.
subscapularis(medial rotate) Supraspinatus(abducts the arm).
Infraspinatus(adducts and lateral rotate) teres minor(same thing)
Difference between lateral rectus and medial rectus?
Lateral rectus- abduct the eyeball(away from midline). Medial rectus(on other side)- adduct the eyeball
explain internal intercostal
BREATHING OUT, it decreases the thoratic cage during exhalation.
explain enxternal intercostal
BREATHING IN. it expands the thoratic cavity during inhaling and works with DIAPHRAGM.
Function and fibers of the trapezius?
Upper fiber- elevates the scapula
middle fiber- abduct the scapula
lower fiber- depress scapula
Trapezius- stablize and move scapula
Function of serractus anterior?(knife shaped)
Protract the scapula
Erector spinae includes
liocostalis, longissimus, spinalis(extension of the trunk)
Explain planterflextion ?
Planter flexion- extension of the ankle in downward motion. caused by gastrocenminus and soleus.
Name the functions of the longest human muscle?
Sartouris! flex the hip, lateral rotate, abducts. Named after tailor sitting pose.
Antagonist to glutes maximus?
Glutes maximus(extend the hip) is antagonist to rectus femoris(flex the hip).
Antagonist to vastus medialralis?
vastus medialralis(extend leg) is antagonist to biceps femoirs(flex the leg)
3 muscles that flex the hip?
sartouris, rectus femoris, tensor faiscae latae.
3 fibers of deltiod(allows for the abduction and adduction of the arm)?
Anterior fiber- flex the arm
medial fiber- abduct the arm
posterior fiber- extends the arm
Origin and insertion of deltoid ?
Orginates on the lateral clavicle and spine of the scapula. Inserts on detiold tuberosity of humerus.
Muscle that abducts(extend) the arm?
extensor carpi radials longus. extensor carpi ulnaris
Muscle that abducts the thigh?
Tensor fasciae latae
what muscles flex the leg
semitendinosus, semimembranosus, biceps femoris.
which muscle flex the forarm
biceps brachii, brachialis, brachioradialis
pectoralis minor origin and function?
orginates on ribs 3-5 and coracoid process. protects/ abduct the scapula
muscle named after how big it is
gluteus maximus
rectus femoris origin and insert?
ORGIN: ilium portion of hip bone and INSERT: patella
which muscles abduct the thigh
gluteus medials, sartourisand tensor fascaie latae
which muslce in charge of planter flexion and dorsiflextion?
tibula anterior(dorsifelxion) soleus and gastrocnemius(planter)
Explain the axon terminal function?
Once the action potential reaches the end of the axon terminal, it causes the neurotransmitter acetylcholine to diffuse across the synaptic cleft and bind to the muscle fiber receptors, thereby initiating a muscle contraction.
Neuromuscular junction?
synapes between motot plate and axon terminal.
Rectus abdominus origin?
originates on the chest of pubis. Inserts on costal cartilage.
