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What is the nerve which innervates the vas deferens?
The testicular nerve and the nerve to the cremaster innervate the vas deferens in the spermatic cord.
Does coronary vessels have both parasympathetic and sympathetic innervation?
Yes, coronary vessels have both parasympathetic and sympathetic innervation. Parasympathetic input leads to vasodilation of coronary vessels, while sympathetic input can cause vasoconstriction in response to stress or exercise. The balance between these two systems helps regulate blood flow to the heart.
Do Sympathetic nerve fibers penetrate the aortic arch?
Yes, sympathetic nerve fibers penetrate the aortic arch along with the branches of the vagus nerve. These fibers help regulate heart rate and blood pressure by influencing the contractions of the heart and the diameter of blood vessels.
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.
What neurotransmitter is used by most postganglionic sympathetic neurons?
At the effector end (nerve to effector organ junction) the transmitter is Nor Adrenaline. However, at the nerve-nerve junctions (ganglions) the transmitter is Acetyl Choline.
Where is the central of sympathetic nerve?
is it the trigeminal nerve
Is the vagus nerve sympathetic?
No. The vagus nerve is in the parasympathetic system
Is the vagus nerve sympathetic or parasympathetic?
The vagus nerve is parasympathetic.
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 nerves innervate the heart?
vagus nerve and sympathetic fibers
Is the vagus nerve sympathetic or parasympathetic in its function?
The vagus nerve is primarily parasympathetic in its function.
Which nerves release acetylcholine and adrenaline?
ALL pre- and post-ganglionic parasympathetic nerve cells PRE-ganglionic sympathetic nerve cells POST-ganglionic sympathetic nerve cells to sweat glands ONLY
Which organ or tissue has no sympathetic nerve supply?
Skin
What is the nerve which innervates the vas deferens?
The testicular nerve and the nerve to the cremaster innervate the vas deferens in the spermatic cord.
Does coronary vessels have both parasympathetic and sympathetic innervation?
Yes, coronary vessels have both parasympathetic and sympathetic innervation. Parasympathetic input leads to vasodilation of coronary vessels, while sympathetic input can cause vasoconstriction in response to stress or exercise. The balance between these two systems helps regulate blood flow to the heart.
What is the nerve supply of parathyroid gland?
Superior or middle cervical sympathetic ganglia
What vertebral level does the sympathetic nerve leave the spinal cord?
Fourth thoracic
