Superficial Layer of Deep Fascia alar fascia retrovisceral space danger space

The Cervical Triangles and Their Contents

Posterior Triangle Occipital Triangle superficial cervical nerves spinal accessory nerve occipital a. & v. posterior portion of external jugular vein Subclavian Triangle (Supraclavicular or Minor Vascular Triangle) subclavian artery and vein (and branches) supraclavicular nerves

Submandibular Triangle Submandibular gland Submandibular lymph node Facial a. & v. Lingual a. & v. Hypoglossal nerve Carotid (Major Vascular) Triangle Common carotid a. Internal carotid a. External carotid a. Lingual a. & v. Facial a. & v. Internal jugular v. Vagus n. Hypoglossal n. Submental Triangle Submental a. & v. Mylohyoid n. Submental lymph node Muscular (Visceral) Triangle Infrahyoid muscles Larynx Anterior Triangle

Sternocleidomastoid Suprahyoid Muscles Digastric Stylohyoid Mylohyoid Geniohyoid Hyoglossus Infrahyoid Muscles Sternohyoid Sternothyroid Omohyoid Thyrohyoid Anterior Neck Musculature

Cervical Nerve Plexus Superficial Portion (Primarily Sensory ) – Lesser Occipital N. – Great Auricular N. – Transverse Cervical N – Supraclavicular Nerves Deep Portion (Ansa Cervicalis) [Primarily Motor ] – Branches of C1 - C4 which innervate the geniohyoid, and all infrahyoid muscles.

anterior scalene m. middle scalene m. posterior scalene m. longus capitus m.

Suboccipital Triangle Muscles – Rectus Capitus Posterior Major – Rectus Capitus Posterior Minor – Obliqus Capitus Superior – Obliqus Capitus Inferior Contents – Vertebral A. & V. – Suboccipital N. (posterior rami of C1, only motor)

– Trapezius – Splenius Capitus – Semispinalis Capitus – Longissimus Capitus – Scalenus Anterior, Middle and Posterior Posterior Neck Musculature

Sensory Innervation of Face and Head