By What are cranial nerves II XII?
Cranial nerve I is a fiber tract emerging from the brain directly, while cranial nerves II through XII arise from the diencephalon and brain stem….Anatomy and function:
| Cranial Nerve | Function |
|---|---|
| XII. Hypoglossal | Motor – tongue |
Which cranial nerve is CN XII?
Hypoglossal Nerve
The Hypoglossal Nerve is the 12th Cranial Nerve (Cranial Nerve XII). It is mainly an efferent nerve for the tongue musculature. The nerve originates from the medulla and travels caudally and dorsally to the tongue.
What are the 12 cranial nerves and their uses?
Overview of the 12 CNs
| CN | Function | Quality |
|---|---|---|
| I—olfactory nerve (smell) | Transmits signals from the olfactory organ (nose) to the brain | Somatosensory and afferent |
| II—optic nerve (vision) | Transmits visual signals from the retina to the brain | Somatosensory and afferent |
What are the 12 cranial nerves in order?
The twelve cranial nerves, in order from I to XII are: olfactory nerve, optic nerve, oculomotor nerve, trochlear nerve, trigeminal nerve, abducens nerve, facial nerve, vestibulocochlear nerve, glossopharengeal nerve, vagus nerve, spinal accessory nerve, and hypoglossal nerve.
Which is the largest cranial nerve?
vagus nerve
The vagus nerve (cranial nerve [CN] X) is the longest cranial nerve in the body, containing both motor and sensory functions in both the afferent and efferent regards.
How is the optic nerve cranial nerve II classified?
Cranial nerves I (olfactory), II (optic), and VIII (vestibulocochlear) are considered purely afferent. Cranial nerves III (oculomotor), IV (trochlear), VI (abducens), XI (spinal accessory), and XII (hypoglossal) are purely efferent.
What is the largest cranial nerve?
trigeminal nerve
The trigeminal nerve is the largest and most complex of the 12 cranial nerves (CNs). It supplies sensations to the face, mucous membranes, and other structures of the head. It is the motor nerve for the muscles of mastication and contains proprioceptive fibers.
When a neurologist asks a patient to smile which cranial nerve is being tested?
Cranial Nerve VII – Facial Nerve Ask the patient to smile, show teeth, close both eyes, puff cheeks, frown, and raise eyebrows. Look for symmetry and strength of facial muscles. See Figure 6.18 for an image of assessing motor function of the facial nerve.
What are the 31 spinal nerves?
Spinal nerve, in vertebrates, any one of many paired peripheral nerves that arise from the spinal cord. In humans there are 31 pairs: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal. Each pair connects the spinal cord with a specific region of the body.
Which is the shortest cranial nerve?
trochlear nerve
The trochlear nerve is the fourth cranial nerve (CN IV) and one of the ocular motor nerves that controls eye movement. The trochlear nerve, while the smallest of the cranial nerves, has the longest intracranial course as it is the only nerve to have a dorsal exit from the brainstem.
Which is the thinnest cranial nerve?
The trochlear nerve is the longest and thinnest of all cranial nerves, making it susceptible to trauma.