What characterizes the motor end plate of the muscle fiber?

What characterizes the motor end plate of the muscle fiber?

The motor endplate of the white fiber is large and has a complicated structure, that of the red fiber is small and less complicated, and that of the intermediate fiber possesses intermediate characteristics.

What is the function of the motor end plate?

mo·tor end·plate The large and complex end-formation by which the axon of a motor neuron establishes synaptic contact with a striated muscle fiber (cell).

What is the role of motor end plate in muscle contraction?

Mechanism of action. Botulinum toxin’s effects occur at the motor end plate. Muscle contraction occurs when motor nerve terminal impulse reaches a nerve ending, which in turn releases acetylcholine across the neuromuscular gap to the muscle signaling muscle contraction.

What does the motor end plate contains?

Embedded in the end plate are thousands of receptors, which are long protein molecules that form channels through the membrane. Upon stimulation by a nerve impulse, the terminal releases the chemical neurotransmitter acetylcholine from synaptic vesicles.

What is the motor end plate quizlet?

– Motor end plate—the muscle fiber membrane in which the sarcolemma is tightly folded and where nuclei and mitochondria are abundant. – Synaptic cleft—space between the synaptic end bulb and motor end plate.

What is the end plate of a muscle?

Definition. The region of the muscle fibers where the motor nerves terminate on each skeletal muscle fiber, is termed the muscle endplate. It is at this endplate that the perisynaptic Schwann cells are found interspaced between the nerve terminal and the muscle fiber.

What is a muscle end plate?

What is motor end-plate potential?

end-plate potential (EPP), chemically induced change in electric potential of the motor end plate, the portion of the muscle-cell membrane that lies opposite the terminal of a nerve fibre at the neuromuscular junction.

What kind of receptors are found at the motor end plate quizlet?

in addition to the post junctional receptors on the motor endplate, acetylcholine receptors can also be found outside the neuromuscular junction and are called extra-junctional receptors. they are found in their greatest concentration around the end plate in the peri-junctional zone.

What are end plates?

The end plate is a bilayer of cartilage and bone that separates the intervertebral disks from the adjacent vertebrae (Fig. 1A to ​ C). During prenatal development, the future vertebra starts as a cartilage anlagen that arises from chondrification centers of the sclerotomes during the sixth embryonic week (Fig.

What is a motor end-plate potential?

What is an end-plate potential quizlet?

End-plate potential (EPP) is the postsynaptic potential induced at the neuromuscular junction by the opening of the nicotinic acetylcholine receptor.

Is end-plate potential an action potential?

The end-plate potential is a graded potential (it is not all-or-none) that propagates electrotonically to the neighboring patch of muscle fiber membrane where it initiates an action potential on the muscle much like it does on unmyelinated nerves.

What kind of receptors are found at the motor end plate?

Cholinergic receptors are concentrated at the motor end-plate region of the sarcolemma in normal skeletal muscle. When the motor end plate is depolarized, the action potential is propagated to voltage-sensitive sodium channels in the adjacent sarcolemma.

What is end plate changes?

End plate remodeling and Modic changes are thought to occur in the response to a number of factors, including natural degeneration of the disc or bone, infection within or around the disc or adjustments of the vertebrae in response to changes in load pressures.

What is end plate change?

Vertebral endplate changes/modic changes (MC) are the MRI-images of inflammatory vertebral endplate damage that are often related to general disc degeneration. • In patients with prolonged back pain, the prevalence of MC is 40%. • In individuals with MC, more than 90% will have back pain within 1 year.

What is meant by end plate potential?

What is endplate signal?

Vertebral endplate signal changes (VESC) are more common among patients with low back pain (LBP) and/or sciatica than in people who are not seeking care for back pain. The distribution and characteristics of VESC have been described in people from clinical and non-clinical populations.

What is the function of the motor end plate Quizlet?

The Motor End Plate The motor end-plate is the connection between the motor nerve and the skeletal muscle cell. Its function is to transmit the electrical signal (= action potential) from the nerve cell to the muscle cell. This is the stimulus that will make the skeletal cell contract.

How does the end plate potential work?

The end-plate potential is a graded potential (it is not all-or-none) that propagates electrotonically to the neighboring patch of muscle fiber membrane where it initiates an action potential on the muscle much like it does on unmyelinated nerves.

What is another name for the motor end-plate?

Another name for the motor end-plate is ‘neuromuscular junction’ (‘neuro’= nerve and ‘muscular’ = muscle) top? 1. A presynaptic membrane in the distal part of the axon

What is the neuro-transmitter in the motor endplate?

In the motor endplate, the neuro-transmitter is always acetylcholine (ACh) 5. A postsynaptic membrane of the muscle cell. These are typically folded ( guess why?