Muscular System Flashcards
External Oblique
decompresses ribs, flexes spinal column, compresses abdominal cavity
Latissimus Dorsi
adducts, medially rotates, and extends the arm
Hamstrings
extends hip and flexes knee
Internal Oblique
decompresses ribs, flexes spinal column, compresses abdominal cavity
runs opposite to external oblique, and is deeper
Gracilis
hip adduction, knee flexion, and knee internal rotation
Soleus
extends foot
Brachioradialis
flexes forearm at elbow
Biceps Brachii
flexes lower arm
triceps brachii
extends lower arm
Deltoid
abducts the upper arm
Frontalis
wrinkles forehead, raises eyebrows
Orbicularis Oculi
closes eyelid, tightens skin on forehead
Masseter
closes jaw
Zygomaticus
raises corners of mouth
Orbicularis Oris
compresses and closes lips
Sternocleidomastoid
flexes head, rotates head to opposite side
Pectoralis major
flexes arms and adducts upper arm
Intercostals
expand and shrink chest cavity
rectus abdominis
compresses abdomen
sartorius
flexes and rotates thigh and leg
adductor muscle
adducts the legs
gastrocnemius
points toes, flexes lower leg
Iliopsoas
flexes and internally rotates thigh at hip joint, flexes trunk
Trapezius
moves shoulder, extends head
Gluteus medius
abducts and rotates thigh
gluteus maximus
extends femur and rotates it outward
muscle fiber
muscle cell
Fascia
a sheet made of fibrous connective tissue that covers, supports, and separates muscle
sarcomere
contractile unit of muscle
myofibril
tightly packed filament bundles found within skeletal muscle fibers
actin
thin filament of a muscle fiber
myosin
thick filament of muscle fiber
sarcoplasmic reticulum
houses the calcium needed to bind to the troponin
tropomyosin
tendon
attaches muscle to bone
ligament
attaches bone to bone
muscle microanatomy flowchart
muscle (fascia/epimysium) -> fasicle (perimysium) -> muscle fiber (endomysium) -> myofibril
sarcolemma
plasma membrane of a muscle fiber
transverse tubules (T tubules)
assist in muscle contraction; located along the sarcolemma
sarcoplasm
the cytoplasm of the muscle cell; has lots of mitochondria