Triangles Of The Neck Flashcards
The SIDE of NECK ~QUADRILATERAL shape
• BOUNDARIES:
• SUPERIOR-
• INFERIOR:.
• MEDIALLY:
• POSTERIORLY (LATERALLY):
The SIDE of NECK ~QUADRILATERAL shape
• BOUNDARIES:
• SUPERIOR- lower border of the body of the mandible + imaginary line drawn from the angle of the mandible to the mastoid process
• INFERIOR: Upper border of the clavicle.
• MEDIALLY: Midline of neck
• POSTERIORLY (LATERALLY): Anterior border of the Trapezius muscle
Quadrilateral space divided by ——— muscle 2 main triangles
• The Sternocleidomastoid muscle →moves obliquely —— and —— from —— and —— (ORIGIN) to —— and —— (INSERTION)
• Antero-medially: —— triangle
• Postero-laterally: —— triangle
Quadrilateral space divided by Sternocleidomastoid muscle 2 main triangles
• The Sternocleidomastoid muscle →obliquely upwards and backwards from clavicle and sternum (ORIGIN) to mastoid process and Superior nuchal line (INSERTION)
• Antero-medially: anterior triangle
• Postero-laterally: posterior triangle
Posterior triangle
• BOUNDARIES :
• -anteriorly ———
• posteriorly———
• -inferiorly———
• The apex of the triangle is formed by the ——— muscles on —— bone
Posterior triangle
• BOUNDARIES :
• The Sternocleidomastoid -anteriorly
• The Trapezius muscle-posteriorly
• The Clavicle -inferiorly
• The apex of the triangle is formed by the 2 muscles on occipital bone
The ROOF of the posterior triangle formed by:
The ROOF of the posterior formed by:
1. Skin
2. Superficial fascia
3. Platysma muscle
4. Investing layer of the deep cervical fascia
The FLOOR of posterior triangle formed by the following muscles from above downwards:
The FLOOR of formed by the following muscles from above downwards:
1. Splenius Capitis
2. Levator scapulae
3. Posterior scalene
4. Middle scalene
5. Anterior scalene
The posterior triangle is sub-divided into 2 smaller by the ——— muscle .
• These are the :
. ———
The posterior triangle is sub-divided into 2 smaller by the Inferior belly of the Omohyoid muscle .
• These are the :
. Supraclavicular . Occipital
Supraclavicular triangle
• It is formed by:
Supraclavicular triangle
• It is formed by:
1. Inferior belly of Omohyoid 2. Clavicle
3. Sternocleidomastoid
The Occipital triangle
• The Occipital triangle is formed by the
The Occipital triangle
• The Occipital triangle is formed by the
1. Inferior belly of Omohyoid
2. Trapezius muscle
3. Sternocleidomastoid muscle
CONTENTS OF POST triangle
• NERVES and PLEXUSES:
CONTENTS OF POST
• NERVES and PLEXUSES:
1. Spinal acessory nerve
2. Branches of Cervical plexus
3. Roots and trunks of brachial plexus
Content of posterior triangle
VESSELS:
VESSELS:
1. Subclavian artery
2. Transverse Cervical artery
3. Suprascapular artery
4. External jugular vein (terminal part)
Content of posterior triangle
LYMPH NODES:
MUSCLES:
LYMPH NODES:
1. Occipital
2. Supraclavicular
MUSCLES:
1. Inferior belly of Omohyoid muscle
CLINICAL SIGNIFICANCE OF THE POSTERIOR TRIANGLE
1. The Accessory Nerve may be damaged ,while taking ———
2. The ——— Vein is superficial location here, and vulnerable to traumatic injury
CLINICAL SIGNIFICANCE OF THE POSTERIOR TRIANGLE
1. The Accessory Nerve may be damaged ,while taking lymph node biopsy
2. The External Jugular Vein is superficial location here, and vulnerable to traumatic injury
ANTERIOR TRIANGLE
• BOUNDARIES:include
• ROOF:include
ANTERIOR TRIANGLE
• BOUNDARIES:
Anterior border of the SCM muscle midline of the neck
inferior border of the mandible
• ROOF:
• Skin
• Superfacial fascia and platysma muscle • Investing layer of deep cervical fascia
SUBDIVISIONS OF THE ANTERIOR TRIANGLE
• The anterior triangle is divided into four smaller triangles:
SUBDIVISIONS OF THE ANTERIOR TRIANGLE
• The anterior triangle is divided into four smaller triangles:
1. SUBMENTAL TRIANGLE
2. SUBMANDIBULAR TRIANGLE
3. CAROTID TRIANGLE
4. MUSCULAR TRIANGLE
SUBMENTAL TRIANGLE
• Formed by the :
SUBMENTAL TRIANGLE
• Formed by the : anterior midline of
neck
hyoid bone
anterior belly of digastric muscle