ns6 posterior triangle of neck
DESCRIPTION
NS6 Lecture 6 of 63 in the Neuroscience Module "Posterior Triangle of the Neck" [Anatomy]TRANSCRIPT
Posterior Triangle of Neck
Dr. Skantha KandiahMBA, MSc (NUI),
MB BCh BAO (NUI), LRCP & SISenior Lecturer in Anatomy and Lecturer in Healthcare
ManagementRCSI
Posterior Triangle
Posterior Triangle
• Base: Middle 1/3 of the clavicle
• Roof: Investing layer of deep cervical fascia
• Floor: prevertebral fascia lying on splenius, levator scapulae and scalenus medius
Contents
• Upper trunk of Brachial Plexus• Apex of the lung extends to 2cm above the
middle 1/3 of the clavicle• Lymph nodes• Subclavian artery – at root of neck• Subclavian vein – at root of neck• External Jugular Vein• Spinal part of XI
External Jugular Vein
XI
• Accessory nerve
• Spinal and Cranial parts
• Spinal part accessory nerve – superficial structure in posterior triangle
• 1/3 down the posterior border of SCM to 2/3 down the anterior border of trapezius
XI
XI
• SCM
• Trapezius
• How do you test above muscles?
• Spinal and cranial parts
Other Nerves…..
Cervical Plexus: Muscular Branches
• Anterior primary rami of the upper cervical nerves form the cervical plexus
• ansa cervicalis: C1,2,3 and XII (descendens hypoglossi)
• Ansa cervicalis supplies the strap muscles
• Phrenic nerve: C3,4,5
Cervical Plexus: Cutaneous Branches
• Lesser occipital C2: upper triangle, behind ear
• Great Auricular C2,3: skin over parotid
• Transverse Cervical C2,3: chin to sternum
• Supraclavicular C3,4
Stab Wound to Posterior Triangle
• Upper trunk brachial plexus injury
• What is it called?
• Apex of the lung is here, so what might happen?
• Bleeding from?
Sample Question
• Describe the boundaries and contents of the posterior triangle of the neck. Explain the consequences of a stab injury to the posterior triangle. Give surface markings of any important structures you name.