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POSTERIOR TRIANGLE OF NECK STEVEN J. ZEHREN, PH.D. BOUNDARIES OF POSTERIOR TRIANGLE STERNOCLEIDOMASTOID MUSCLE (SCM) Mastoid process Sternal head Clavicular head TORTICOLLIS TRAPEZIUS MUSCLE XI. SPINAL ACCESSORY N. SKELETAL MOTOR --- TO STERNOCLEIDOMASTOID & TRAPEZIUS MUSCLES XI STERNOCLEIDOMASTOID M. TRAPEZIUS M. ROOF OF POSTERIOR TRIANGLE Investing layer of deep cervical fascia Platysma m. FLOOR OF POSTERIOR TRIANGLE MUSCLES OF FLOOR OF POSTERIOR TRIANGLE Muscles of floor Splenius capitis m. Levator scapulae m. Post., mid., & ant. scalene mm. FASCIAL FLOOR OF POSTERIOR TRIANGLE Prevertebral layer of deep cervical fascia SPLENIUS CAPITIS MUSCLE LEVATOR SCAPULAE MUSCLE INNERVATION OF LEVATOR SCAPULAE M. SCALENE MUSCLES Anterior scalene m. Middle scalene m. Posterior scalene m. Rib 1 MUSCLES PRODUCING MOVEMENT OF THE CERVICAL INTERVERTEBRAL JOINTS INNERVATION OF PREVETEBRAL AND SCALENE MUSCLES VENTRAL RAMI: CONTENTS OF POSTERIOR TRIANGLE OMOHYOID MUSCLE OMOHYOID MUSCLE Omohyoid (superior belly) Omohyoid m. (inferior belly) OCCIPITAL AND OMOCLAVICULAR TRIANGLES Occipital triangle Omoclavicular triangle (supraclavicular triangle) (subclavian triangle) NERVES CAREFREE & CAREFUL ZONES CAREFREE & CAREFUL ZONES Accessory N. (XI) F. magnum Jugular f. C2 spinal n. Acessory n. (XI) Sternocleidomastoid m. C3 spinal n. C4 spinal n. Trapezius m. Efferent fibers Afferent fibers 5 Roots (vental rami) 3 Trunks 3 ant. Divisions 3 post. Divisions C5 C6 Superior 3 Cords C7 Middle C8 5 terminal Branches Inferior Lateral T1 Musculocutaneous n. Posterior Axillary n. Medial Radial n. Median n. Ulnar n. “Roger Travis Drinks Cold Beer” BRACHIAL PLEXUS IN RELATIONSHIP TO CLAVICLE FIVE COMPONENTS OF CERVICAL PLEXUS: XII XI Cutaneous NerveS C1 Ansa Cervicalis: Motor Nerves To Prevertebral Muscles C2 SUPERIOR ROOT C3 INFERIOR ROOT C4 ANSA Phrenic Nerve Contributions From C3 & C4 To XI CUTANEOUS BRANCHES OF THE CERVICAL PLEXUS CERVICAL PLEXUS Lesser occipital n. (C2,3) Great auricular n.(C2,3) Transverse cervical n. (C2,3) Supraclavicular nn. (C3,4) VESSELS ARTERIES IN POSTERIOR TRIANGLE 1 3 ARTERIES IN POSTERIOR TRIANGLE TRANSVERSE CERVICAL A. THYROCERVICAL TRUNK SUPRASCAPULAR A. EXTERNAL JUGUAR VEIN Superficial temporal v. Maxillary v. Facial v. Posterior auricular v. External jugular v. Retromandibular v. Common facial v. (to IJV) Transverse cervical v. Suprascapular v. Subclavian v. Anterior jugular v. INTERSCALENE TRIANGLE BOUNDARIES & CONTENTS OF THE INTERSCALENE TRIANGLE Anterior scalene m. Middle scalene m. Brachial plexus Subclavian a. Rib 1 Anterior scalene m. Middle scalene m. Cervical rib compresses subclavian a. Lowest trunk of brachial plexus elevated by cervical rib ANTERIOR RELATIONSHIPS OF ANTERIOR SCALENE MUSCLE Ascending cervical a. Anterior scalene m. Phrenic n. Inferior thyroid a. Transverse cervical a. Suprascapular a. Thyrocervical trunk Subclavian v. SUBCLAVIAN VEIN PUNCTURE CERVICAL PLEURA (CUPULA) Cervical pleura DEEP FASCIAE OF NECK Investing fascia Retropharyngeal space Pretracheal fascia * Buccopharyngeal fascia * Carotid sheath Common carotid a. Internal jugular v. Vagus n. Prevertebral fascia * = Component of visceral fascia Base of skull Buccopharyngeal fascia Retropharyngeal space Prevertebral fascia Mediastinum