T-Tubule -Invaginations of the sarcolemma penetrating deep into the interior of the muscle cell.
Synaptic Cleft -the space between the axon terminal and the motor end plate.
Axon Terminal -the swollen distal end of the motor neuron axon.
Sarcolemma -the muscle cell membrane.
Synaptic Vesicles -structures within the axon terminal that contain the neurotransmitter acetylcholine (ACh).
Terminal Cisternae & Sarcoplasmic Reticulum (SR) -structures within skeletal muscle cells that serve as reservoirs of calcium ions.
Motor End Plate -a folded region of the sarcolemma at the neuromuscular junction.
