Anatomy of Thorax Flashcards
Sternal Angle
T4/5
Spinal nerve posterior rami
Supply skin + muscles posterior to vertebral column
Spinal nerve anterior rami
Intercostal nerves innervating the intercostal muscles and the skin that overlies them
Pectoralis Major Action
Flexion, medial rotation + adduction of arm
Aids inspiration- accessory muscle
Pec Major Innervation
Pectoral nerves (C5-T1) from brachial plexus
Pectoralis Minor Action
Helps elevate rib cage
Inspiration
Pec Minor place
Coming from Coracoid Process superiorly down to the 3/4/5th rib
Pec minor innervation
Pectoral nerves (C5-T1) from brachial plexus
Sternocleidomastoid place
From mastoid process superiorly
Attaches to sternum and clavicle
Sternocleidomastoid action
Elevates chest
Inspiration
Sternocleidomastoid innervation
Spinal Accessory Nerve XI
Serratus anterior placement
Underside of scapula
Wraps around chest to insert onto ribs
Makes up medial wall of axilla
Serratus anterior innervation
Long thoracic (C5-C7) superficial to the muscle
Long thoracic damage
Scapular winging
Rectus abdominis placement
Attaches to costal margin
Runs down front of abdomen
Attaches to pubic symphysis
Recuts abdominis action
Pulls down ribcage
Aids forced expiration
Rectus abdominis innervation
Intercostal and subcostal nerves T7-T12
External intercostal muscles
Hands in pockets
Pulls ribcage up and out
Elevates rib cage –> inspiration
Internal intercostal muscles
Hands on shoulders
Depressing ribcage –> expiration
Innermost intercostal muscles
Hands on shoulders
Depressing ribcage –> expiration
Muscles of respiration innervation
T2-11
Neurovascular bundle
Between internal and innermost intercostals in costal groove
Intercostal nerves innervation
Anterior rami of thoracic spinal nerves