May, 2017 | Master Of Medicine

Monthly Archives: May 2017

Layers of SCALP ,blood supply and nerve supply

SCALP has 5 layers and it can be memorized by a simple mnemonic SCALP

Layers of SCALP-Mnemonic

S -Skin

C-Connective tissue

A-Aponeurosis

L-Loose areolar tissue

P-Pericranium

Blood supply of scalp

The Internal carotid and External carotid artery which together give 5 branches to scalp.

Internal carotid artery

1.Supratrochlear artery- Supplies the midline of forehead.It is the branch of he ophthalmic branch of the internal carotid artery.

2Supraorbital artery- Supplies the lateral forehead and scalp as far up as the vertex. The supraorbital artery is a branch of the ophthalmic branch of the internal carotid artery.

External carotid artery

1.Superficial temporal artery- frontal and parietal branches of Superficial temporal artery supply much of the scalp

2.Occipital artery-supply  the posterior aspect of the scalp

3.Posterior auricular artery- It ascends behind the auricle to supply the scalp above and behind the auricle.

Nerve supply of scalp

1.Ophthalmic division of the Trigeminal nerve-via Supratrochlear nerve and the supraorbital nerve

2.Greater occipital nerve (C2)- Supplies the area posteriorly up to the vertex

3.Lesser occipital nerve (C2) -Supplies behind the ear

4. Maxillary division of the trigeminal nerve-Via zygomaticotemporal nerve supplies hairless temple

5.Mandibular division of the trigeminal nerve-Supplies via Auriculotemporal nerve

The mnemonic which can be used to learn the innervation of scalp is:

Z-GLASS

Zygomaticotemporal nerve

Greater occipital nerve

Lesser occipital nerve,

Auriculotemporal nerve

Supratrochlear nerve

Supraorbital nerve

Lymphatic drainage

Posterior half of the scalp drain to occipital and posterior auricular nodes. Anterior half drain to the parotid nodes,eventually draining into submandibular and deep cervical nodes.

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