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Insiders' Look Within The Muscle

 
Across
The awareness one has of the position of their body and extremities. This ability is facilitated by multiple mechanosensory receptors that are sensitive to stretch and tension. Muscles, tendons, skin, and joints all have these specialized receptors. When stretch occurs, the receptors send signals to the spinal cord and up to the brain.
The amount of tension within a muscle at all times. This is regulated by our body’s postural control system which consists of the archeocerebellum, reticular formation, and the vestibular system. At rest and during high risk activities for our non-antigravity muscles, the reticulospinal tract is helps regulate. However, the vestibulospinal tract is what is involved for antigravity muscles during high risk activity.
The connection between a motor neuron and a muscle fiber in which it can facilitate the firing and contraction of a muscle. When an action potential travels through the neuron, chemicals are released into the synaptic cleft at this connection between the neuron and muscle. The chemicals attach to the receptors at the muscle, which then lead to depolarization of the cell, which even further leads to the action potential being created within the muscle and sent out to produce a contraction.
This is typically recruited first in regards to recruitment pattern. This is because they are slow-twitch and fatigue resistant motor units that deal with low force and slow contractions.
Down
The sequence of activation of motor units in order to increase the strength of a voluntary muscle contraction by either increasing the firing of motor units or increasing the rate at which they fire (once maximum motor units are recruited).
These are recruited last in regards to recruitment pattern. The type A version is fast twitch and fatigue resistant for larger and faster contractions, and type B version is fast twitch and easily fatigued and used for the largest force and fastest contractions.
A type of proprioception receptor that consists of intrafusal fibers, sensory nerve endings, and gamma motor neurons. It is located within a muscle belly and can sense when a muscle has been stretched out. They themselves stretch as the muscle stretches and relay information to the spinal cord and up to the brain to form a response to stretch. Without this, regulating muscle length and keeping balance would be difficult