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Are most innervated blood vessels receive only sympathetic nerve fibers?
No, most blood vessels are innervated by both sympathetic and parasympathetic nerve fibers. However, sympathetic nerve fibers typically have a more pronounced effect on blood vessel activity compared to parasympathetic fibers.
What is the nerve supply of the muscles of facial expression?
The muscles of facial expression are innervated by the facial nerve (cranial nerve VII). This nerve originates in the brainstem and branches out to supply the muscles involved in facial expressions, such as the orbicularis oculi, zygomaticus, and frontalis muscles. Damage to the facial nerve can result in facial muscle weakness or paralysis on the affected side of the face.
What region of the skin are the specialized nerve endings found?
Specialized nerve endings such as Meissner's corpuscles and Pacinian corpuscles are found in the dermis layer of the skin. These nerve endings are responsible for sensations like touch, pressure, and vibration.
This parasympathetic nerve emerges from the pons?
The parasympathetic nerve that emerges from the pons is the cranial nerve X, also known as the vagus nerve. It plays a key role in regulating many autonomic functions in the body, such as controlling heart rate and digestion.
What are the four nerve endings in the skin?
The four main types of nerve endings found in the skin are free nerve endings (responsible for pain and temperature sensation), Merkel discs (responsible for light touch and pressure), Meissner's corpuscles (responsible for light touch), and Pacinian corpuscles (responsible for deep pressure and vibration sensation).
Are most innervated blood vessels receive only sympathetic nerve fibers?
No, most blood vessels are innervated by both sympathetic and parasympathetic nerve fibers. However, sympathetic nerve fibers typically have a more pronounced effect on blood vessel activity compared to parasympathetic fibers.
What parts of the nervous system controls digestion?
The parasympathetic nervous system is responsible for digestion. The GI tract is innervated by the Gastric nerve, otherwise known as the Vagus nerve.
Is acetylcholine the substance released by axonal endings of the somatic efferent fibers and by the parasympathetic nerve fiber endings?
Yes, it does. In contrast, the sympathetic nerves release adrenaline
What nerves supply the innervation of the bladder and the internal sphincter?
The bladder is innervated by the parasympathetic fibers of the pelvic splanchnic nerves (S2-S4) which stimulate contraction of the detrusor muscle. The internal urethral sphincter is innervated by sympathetic fibers from the hypogastric nerve, which cause it to contract and prevent urine leakage.
What do nerves have to do with exocytosis?
Nerves nerve endings that release neurotransmitters (eg. Acetylcholine) that initiate action potential to the innervated organ causing dpolarization, etc. This can be released through exocytosis.
Which nerve supplies the pelvic floor?
The pudendal nerve (part of the somatic nervous system, voluntary control) innervates the pelvic floor. It also innervates the external urethral sphincter; the internal urethral sphincter is innervated by the pelvic nerve (part of the parasympathetic nervous system, involuntary control).
Which nerve conveys parasympathetic signals to the heart?
The Vegal Nerve conveys parasympathetic signals to the heart
What nerve initiates the SA node to initiate an impulse?
The sinoatrial (SA) node is innervated by the vagus nerve (parasympathetic) and sympathetic nerves. However, the sympathetic nerves play a more significant role in initiating an impulse in the SA node by releasing norepinephrine, which increases heart rate.
Flexor muscles in the anterior arm are innervated by what nerve?
The musculocutaneous nerve
Muscle inserts into the mastoid process?
Posterior Belly of Digastric Muscle (innervated by CN VII) Facial nerve Sternocleidomastoid (innervated by CN XI) Spinal accessory nerve Longissimus Capitis (innervated by dorsal rami of C3-C8 spinal nerves) Splenius Capitis (innervated by dorsal rami of middle cervical spinal nerves)
Do red eared sliders have nerve endings?
All animals have nerve endings.
Which muscle is innervated by the phrenic nerve?
Diaphragm
