Anatomy: Head and Neck Lymphatics and Cranial Nerves IX-XII

Comprehensive vocabulary flashcards covering the lymphatic systems, cranial nerves IX through XII, and autonomic structures of the head and neck based on lecture visuals.

Submental nodes

Lymph nodes located beneath the chin that drain the central part of the lower lip, floor of the mouth, and apex of the tongue.

Jugulodigastric node

A large lymph node of the deep cervical chain located where the posterior belly of the digastric muscle crosses the internal jugular vein; it often receives drainage from the tonsils.

Thoracic duct

The largest lymphatic vessel in the body, which collects most of the body's lymph and empties into the junction of the left internal jugular and subclavian veins.

Cisterna chyli

A dilated sac at the lower end of the thoracic duct that serves as a reservoir for lymph and chylous fluid.

Glossopharyngeal Nerve ($IX$) - Motor Function

Somatic motor innervation that lifts the throat during swallowing through the Stylopharyngeus muscle.

Glossopharyngeal Nerve ($IX$) - Parasympathetic Function

Provides secretomotor innervation to the parotid salivary gland via the otic ganglion and inferior salivatory nucleus.

Glossopharyngeal Nerve ($IX$) - Sensory Function

Carries taste sensation from the $\text{posterior } \frac{1}{3}$ of the tongue and general sensation ($GVA$) from the carotid sinus and carotid body.

Glossopharyngeal neuralgia ($GPN$)

Also known as vagoglossopharyngeal neuralgia, it is characterized by brief, intense pain on one side of the throat that may radiate to the ear.

Vagus Nerve ($X$) - Parasympathetic Function

Regulates the heart rate, breathing, and digestion by innervating the heart, lungs, and abdominal viscera.

Vagus Nerve ($X$) - Somatic Motor Function

Provides innervation to the skeletal muscles of the pharynx and larynx.

Superior laryngeal nerve - External branch

A branch of the Vagus nerve ($X$) that specifically provides motor innervation to the cricothyroid muscle.

Recurrent laryngeal nerve

A branch of the Vagus nerve ($X$) that supplies motor function to most laryngeal muscles (except the cricothyroid) and provides sensation below the vocal folds.

Accessory Nerve ($XI$) - Spinal portion

Arises from the cervical spinal cord and provides motor innervation to the sternocleidomastoid and trapezius muscles.

Accessory Nerve Palsy

An injury to the spinal accessory nerve resulting in clinical signs such as a drooping shoulder, muscle atrophy, and limited shoulder elevation.

Hypoglossal Nerve ($XII$)

A purely motor nerve that controls the intrinsic and extrinsic muscles of the tongue during speech and swallowing.

Testing the Hypoglossal Nerve

The clinical procedure where a patient is instructed to stick out the tongue and move it laterally against resistance.

Ansa cervicalis

A loop of nerves ($C1$, $C2$, and $C3$) belonging to the cervical plexus that innervates the infrahyoid muscles, including the omohyoid, sternohyoid, and sternothyroid.

Stellate ganglion

Also known as the cervicothoracic ganglion, it is a sympathetic ganglion formed by the fusion of the inferior cervical and first thoracic ganglia.

Phrenic nerve

A nerve arising from the cervical plexus ($C3$-$C5$) that travels along the anterior scalene muscle to provide motor control to the diaphragm.

Carotid body

A small cluster of chemoreceptors located near the bifurcation of the common carotid artery that monitors blood oxygen levels and is innervated by the glossopharyngeal nerve ($IX$).