20 Questions
Which lymph nodes accompany the external jugular vein?
Superficial group of cervical lymph nodes
Which lymph nodes drain into the deep nodes?
Superficial group of cervical lymph nodes
Where do the deep nodes drain on the right side?
Right lymphatic duct
Where do the deep nodes drain on the left side?
Thoracic duct
What does the thoracic duct drain?
The entire body except the right side of the head, neck, and thorax above diaphragm
Where is the thoracic duct located?
At the junction of the left internal jugular vein and left subclavian vein
What does the right lymphatic duct drain?
The right side of the head, neck, and thorax above diaphragm
Where is the right lymphatic duct located?
At the junction of the right internal jugular vein and right subclavian vein
How many scalene muscles are there?
3
What is the function of the scalene muscles?
Flex neck laterally and elevate associated rib during inspiration
Which muscle forms the posterior boundary of the posterior triangle of the neck?
Trapezius muscle
Which muscle forms the anterior boundary of the posterior triangle of the neck?
Sternocleidomastoid muscle
What is the inferior boundary of the posterior triangle of the neck?
Clavicle
Which nerve is responsible for innervating the sternocleidomastoid muscle and trapezius muscle?
Spinal accessory nerve
Which nerve is responsible for providing sensory innervation to the skin of the posterior triangle of the neck?
Supraclavicular nerves
Which artery is a branch of the subclavian artery and supplies the posterior triangle of the neck?
Transverse cervical artery
Which vein opens into the subclavian vein and is located within the posterior triangle of the neck?
External jugular vein
Which cranial nerve is contained within the carotid sheath and has many important functions?
Vagus nerve
Which nerve is responsible for motor innervation of the diaphragm?
Phrenic nerve
Which nerve lies behind the anterior scalene muscle and is formed by the ventral rami of spinal nerves C5-T1?
Brachial plexus
Study Notes
Lymph Nodes and Vessels
- The external jugular vein is accompanied by superficial cervical lymph nodes.
- The deep nodes drain into the jugular trunk on the right side, and into the thoracic duct on the left side.
- On the right side, the deep nodes drain into the right lymphatic duct.
- On the left side, the deep nodes drain into the thoracic duct.
- The thoracic duct drains into the junction of the left subclavian and internal jugular veins.
- The thoracic duct is located in the mediastinum and thoracic cavity.
- The right lymphatic duct drains into the junction of the right subclavian and internal jugular veins.
- The right lymphatic duct is located in the root of the neck.
Scalene Muscles
- There are three scalene muscles: anterior, middle, and posterior.
- The scalene muscles elevate the first and second ribs during inspiration.
Posterior Triangle of the Neck
- The posterior boundary of the posterior triangle is formed by the trapezius muscle.
- The anterior boundary of the posterior triangle is formed by the sternocleidomastoid muscle.
- The inferior boundary of the posterior triangle is formed by the clavicle.
Nerves and Arteries
- The spinal accessory nerve is responsible for innervating the sternocleidomastoid and trapezius muscles.
- The cervical nerves (C2-C4) provide sensory innervation to the skin of the posterior triangle of the neck.
- The transverse cervical artery, a branch of the subclavian artery, supplies the posterior triangle of the neck.
- The external jugular vein opens into the subclavian vein and is located within the posterior triangle of the neck.
- The vagus nerve is contained within the carotid sheath and has many important functions.
- The phrenic nerve is responsible for motor innervation of the diaphragm.
- The brachial plexus lies behind the anterior scalene muscle and is formed by the ventral rami of spinal nerves C5-T1.
Test your knowledge of the boundaries and contents of the posterior triangle of the neck with this quiz. Learn about the nerves and muscles that make up this important anatomical region.
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