MRCS 1 neck triangles

Question 1

Posterior triangle of the neck - boundaries

Answer 1

Apex - Sternocleidomastoid and the Trapezius muscles at the Occipital bone
Anterior Posterior border of the Sternocleidomastoid
Posterior - Anterior border of the Trapezius
Base - Middle third of the clavicle

Question 2

Contents of posterior triangle of neck

Answer 2

NERVES

• Accessory nerve
• Phrenic nerve
• Three trunks of the brachial plexus
• Branches of the cervical plexus: Supraclavicular nerve, transverse cervical nerve, great auricular nerve, lesser occipital nerve

VESSELS
External jugular vein
Subclavian artery

MUSCLES
Inferior belly of omohyoid
Scalene

LYMPHNODES
Supraclavicular
Occipital

Question 3

ANTERIOR neck triangle borders

Answer 3

Anterior border of the Sternocleidomastoid
Lower border of mandible
Anterior midline

Question 4

Anterior neck triangle subdivisions

Answer 4

Sub triangles (divided by Digastric above and Omohyoid)
Muscular triangle: Neck strap muscles
Carotid triangle: Carotid sheath
Submandibular Triangle (digastric)

Question 5

Nerve supply to digastric muscle

Answer 5

Anterior: Mylohyoid nerve
Posterior: Facial nerve

Question 6

ANTERIOR triangle content

Answer 6

DIGASTRIC TRIANGLE
Submandibular gland and nodes
Facial vessels
Hypoglossal nerve

MUSCULAR TRIANGLE
Strap muscles
Jugular vein

CAROTID TRIANGLE
Carotid sheath (Common carotid, vagus and internal jugular vein)
Ansa cervicalis