Posterior Triangle Anatomy

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What are the boundaries of the posterior triangle of the neck?

Anterior: Posterior border of sternocleidomastoid muscle. Posterior: Anterior border of trapezius muscle. Inferior (base): Superior aspect of middle third of the clavicle. Superior (apex): Meeting point of sternocleidomastoid and trapezius muscles at the superior nuchal line of the occipital bone.

What forms the roof of the posterior triangle?

The investing layer of the deep cervical fascia, stretching between the sternocleidomastoid and trapezius muscles.

Which structures are found in the superficial fascia overlying the roof of the posterior triangle?

Platysma, external jugular and posterior jugular veins, and cutaneous nerves and vessels.

What are the four cutaneous branches of the cervical plexus that pierce the roof of the posterior triangle?

(a) Lesser occipital nerve (C2) (b) Great auricular nerve (C2, C3) (c) Transverse cervical nerve (C2, C3) (d) Supraclavicular nerves (C3, C4) Signup and view all the answers

Where does the external jugular vein begin and how does it cross the sternocleidomastoid muscle?

It begins just below the angle of mandible, runs downwards and backwards crossing the sternocleidomastoid obliquely and under the cover of platysma. Signup and view all the answers

What structures lie in the floor of the posterior triangle?

Not provided. Signup and view all the answers

What muscles form the floor of the posterior triangle from above downwards?

Semispinalis capitis, Splenius capitis, Levator scapulae, Scalenus medius, First digitation of serratus anterior Signup and view all the answers

What forms the fascial carpet of the floor of the posterior triangle?

Prevertebral layer of deep cervical fascia Signup and view all the answers

What does the inferior belly of omohyoid cross in the lower part of the posterior triangle?

The fascial carpet Signup and view all the answers

What are the two subdivisions of the posterior triangle?

Occipital triangle and subclavian (supraclavicular) triangle Signup and view all the answers

What contents are found in the occipital triangle?

Spinal accessory nerve, 3rd and 4th cervical nerves, Dorsal scapular nerve, Cutaneous branches of cervical plexus, Superficial transverse cervical artery, Occipital artery Signup and view all the answers

What structures are found in the subclavian/supraclavicular triangle?

3rd part of the subclavian artery, Subclavian vein, Terminal part of external jugular vein, Trunks of brachial plexus, Superficial (transverse) cervical, suprascapular, and dorsal scapular arteries, Lymph nodes Signup and view all the answers

What covers the muscular floor of the posterior triangle?

Prevertebral layer of deep cervical fascia Signup and view all the answers

What muscle crosses the lower part of the posterior triangle superficial to the fascial carpet?

Inferior belly of omohyoid Signup and view all the answers

What nerve provides branches to levator scapulae and trapezius muscles in the occipital triangle?

3rd and 4th cervical nerves Signup and view all the answers

What forms the axillary sheath around the subclavian artery and brachial plexus?

Prevertebral layer of deep cervical fascia Signup and view all the answers

Posterior Triangle Anatomy

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Questions and Answers

What are the boundaries of the posterior triangle of the neck?

What forms the roof of the posterior triangle?

Which structures are found in the superficial fascia overlying the roof of the posterior triangle?

What are the four cutaneous branches of the cervical plexus that pierce the roof of the posterior triangle?

Where does the external jugular vein begin and how does it cross the sternocleidomastoid muscle?

What structures lie in the floor of the posterior triangle?

What muscles form the floor of the posterior triangle from above downwards?

What forms the fascial carpet of the floor of the posterior triangle?

What does the inferior belly of omohyoid cross in the lower part of the posterior triangle?

What are the two subdivisions of the posterior triangle?

What contents are found in the occipital triangle?

What structures are found in the subclavian/supraclavicular triangle?

What covers the muscular floor of the posterior triangle?

What muscle crosses the lower part of the posterior triangle superficial to the fascial carpet?

What nerve provides branches to levator scapulae and trapezius muscles in the occipital triangle?

What forms the axillary sheath around the subclavian artery and brachial plexus?

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