Nerve Muscle Physiology Quiz

Study Notes

Acetylcholine at the Neuromuscular Junction

Acetylcholine is the neurotransmitter responsible for initiating muscle contraction.
It is released from the motor neuron at the neuromuscular junction.
Acetylcholine binds to receptors on the muscle fiber membrane, triggering depolarization.

Sarcoplasmic Reticulum Function

The sarcoplasmic reticulum is a specialized endoplasmic reticulum in muscle cells.
Its primary function is to store and release calcium ions (Ca²⁺).
The release of Ca²⁺ triggers the contraction of the muscle fiber.

Motor Neuron Function

Motor neurons transmit signals from the central nervous system to muscle fibers.
This signals the muscle fibers to contract, controlling voluntary movement.

Bulbospongiosus Muscle Origin

In males, the bulbospongiosus muscle originates from the central tendon of the perineum and the posterior surface of the bulb of the penis.
In females, the bulbospongiosus muscle originates from the central tendon of the perineum, the posterior surface of the bulb of the vestibule, and the clitoris.

Bulbospongiosus Nerve Innervation

Regardless of gender, the bulbospongiosus muscle is innervated by the perineal branch of the pudendal nerve.

Bulbospongiosus Muscle Location in Males

In males, the bulbospongiosus muscle surrounds the bulb of the penis and extends to the corpus spongiosum.

Bulbospongiosus Muscle Covering in Females

In females, the bulbospongiosus muscle surrounds the bulb of the vestibule, also known as the vestibular bulbs.

Male Equivalent Structure in Females

In females, the vestibular bulbs are equivalent to the bulb of the penis in males.

Description

Test your knowledge of nerve muscle physiology with this quiz! Explore the role of acetylcholine in the neuromuscular junction, the function of the sarcoplasmic reticulum in muscle cells, and the primary function of the motor neuron in muscle physiology.