sympathetic nerves

The dilator pupillae, innervated by sympathetic nerves from the superior cervical ganglion, cause the pupil to dilate when they contract.

I consider it not so much the optic, as the motor and sympathetic nerves, and the mind, through which the impression is made.

As the main vagus nerves continue into the thorax they become intimately linked with the esophagus and sympathetic nerves from the sympathetic trunks to form the esophageal plexus.

The vagal trunks then join with preaortic sympathetic ganglion around the aorta to disperse with the blood vessels and sympathetic nerves throughout the abdomen.

Clonidine mimics catecholamines in the brain, causing it to reduce the activity of the sympathetic nerves controlling the adrenal medulla.

An increase in diameter is called bronchodilation and is stimulated by either epinephrine or sympathetic nerves to increase air flow.

* Nerves: nerve to cremaster ( genital branch of the genitofemoral nerve ), testicular nerves ( sympathetic nerves )

Generally, norepinephrine and epinephrine ( hormones produced by sympathetic nerves and the adrenal gland medulla ) are vasoconstrictive acting on alpha 1-adrenergic receptors.

In vivo however, extrinsic factors such as an increase in activity of the sympathetic nerves, and a decrease in vagal tone cause the heart to beat more frequently and more forcefully.

These receptors close a negative feedback loop that begins with descending sympathetic nerves from the brain that control the production of catecholamines ( epinephrine, also known as adrenaline, and norepinephrine ) in the adrenal medulla.

Nevertheless, direct stimulation of sympathetic nerves will cause an increase in salivary enzymatic secretions.

One of the neuroendocrine pathways, when activated, results in the release of immune-regulating peptides from the submandibular gland upon neuronal stimulation from sympathetic nerves.

In some neuropathic pain syndromes, " crosstalk " occurs between descending sympathetic nerves and ascending sensory nerves.

* The transverse processes are each pierced by the foramen transversarium, which, in the upper six vertebrae, gives passage to the vertebral artery and vein, as well as a plexus of sympathetic nerves.

In 1842 he demonstrated that sympathetic nerves were largely made up of medullated fibres arising from sympathetic and spinal ganglia.

Medial Part transmits: Superior ophthalmic vein and sympathetic nerves from the plexus around internal carotid artery

He made important investigations on ganglia, nerve-endings, and the sympathetic nerves.

* The sympathetic nerves to the operative limb are anesthetized, leading to vasodilation.