Joints & Movements
Rotating a limb toward the midline
medial rotation
The basic contractile unit of a muscle fiber
sarcomere
Muscle used for smiling
zygomaticus
Main forearm extensor
triceps brachii
Part of a neuron that sends signals away
axon
Turning the foot downward
plantarflexion
The protein that forms thick filaments in a sarcomere
myosin
Main muscle for inhalation
diaphragm
Muscle that dorsiflexes the foot
tibialis anterior
Brain region responsible for balance
cerebellum
The joint type found between carpal bones
plane joint
The dark band in a sarcomere
A band
Muscle that elevates the eyebrows
frontalis
Largest muscle of the buttocks
gluteus maximus
Relay station for sensory input
thalamus
Turning the palm upward
supination
The Z disc marks the boundary of this
sarcomere
Muscle that rotates the head side-to-side
sternocleidomastoid
Muscle that extends the fingers
extensor digitorum
Sensory root entering the spinal cord
dorsal root
The ligament that prevents anterior movement of the tibia
ACL (anterior cruciate ligament)
The light band in a sarcomere
I band
Muscle that protracts the scapula
serratus anterior
Muscle that abducts the thig
tensor fasciae latae
Motor root leaving the spinal cord
ventral root