Nervous system

Nervous system

The organ system which, along with the endocrine system, correlates the adjustments and reactions of the organism to its internal and external enviroment.

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Nervous system

neurons

Anatomy; Nervous system

Neurons or neurones are the core constituents of the nervous system (this was discovered by the Spanish anatomist Santiago Ramón y Cajal in the 20th century). They are formed by a body (soma), ...

The esophageal plexus is formed by fibers from two sources: branches of the vagus nerve and visceral branches of the sympathetic trunk. The esophageal plexus and the cardiac plexus contain the same ...

ethmoidal nerves

Anatomy; Nervous system

The ethmoidal nerves, which arise from the nasociliary nerve, supply the ethmoidal cells; the posterior branch leaves the orbital cavity through the posterior ethmoidal foramen and gives some ...

external laryngeal nerve

Anatomy; Nervous system

The external laryngeal nerve is the smaller, external branch (ramus externus) of the superior laryngeal nerve. It descends on the larynx, beneath the sternothyroid muscle, to supply the cricothyroid ...

external nasal nerve

Anatomy; Nervous system

The external nasal branches (or external nasal nerve) are terminal branches of the anterior ethmoidal nerves (from the ophthalmic division of the trigeminal nerve, CN V), and provide sensory ...

facial nerve

Anatomy; Nervous system

The facial nerve is the seventh (VII) of twelve paired cranial nerves. It emerges from the brainstem between the pons and the medulla, and controls the muscles of facial expression, and functions in ...

femoral nerve

Anatomy; Nervous system

The femoral nerve, the largest branch of the lumbar plexus, arises from the dorsal divisions of the ventral rami of the second, third, and fourth lumbar nerves. It descends through the fibers of the ...