What triangle is the brachial plexus in?

The brachial plexus provides somatic motor and sensory innervation to the upper extremity, including the scapular region. As the brachial plexus travels through the posterior triangle of the neck into the axilla, arm, forearm, and hand, it contains various named regions based on how the plexus is formed.

What are the contents of the carotid triangle?

Branches of the external carotid artery are found in the triangle including:

• superior thyroid artery.
• lingual artery.
• facial artery.
• occipital artery.
• ascending pharyngeal artery.

What nerves are in the carotid triangle?

The main contents of the carotid triangle are the common carotid artery (which bifurcates within the carotid triangle into the external and internal carotid arteries), the internal jugular vein, and the hypoglossal and vagus nerves.

Why is carotid triangle important?

The carotid triangle also houses the carotid sinus or bulb. This structure contains baroreceptors which are responsible in detecting stretch caused by pressure within a vessel and have a role in maintaining blood pressure (baroreceptor reflex).

Why is the carotid triangle called a triangle?

Carotid triangle is one of the subdivisions of anterior triangle of neck. It is so called because it contains all the 3 carotid arteries, viz. common carotid, internal carotid and external carotid.

Where does the brachial plexus cross the posterior triangle?

The trunks of the brachial plexus also cross the floor of the posterior triangle. For anaesthesia of the neck area, a cervical plexus block can be used. Local anaesthetic is injected along the posterior border of sternocleidomastoid at the junction of its superior and middle thirds.

Where are the carotid sheaths located in the skull?

This extends downward from the skull base to fuse with the endothoracic fascia medially and form the axillary sheath laterally, containing the brachial plexus and axillary artery. Located bilaterally between the edges of the prevertebral and pretracheal fasciae are the carotid sheaths.

Which is part of the neck forms the anterior triangle?

The anterior triangle is formed by the anterior border of sternocleidomastoid laterally, the median line of the neck medially and by the inferior border of the mandible superiorly. The apex of the anterior triangle extends towards the manubrium sterni.