Thorax Flashcards
Transversus thoracis
Posterior surface of the lower sternum
Internal surfaces of costal cartilages 2-6
Intercostal n
Weakly depresses the ribs
Sternocleidomastoid
Lateral surface of mastoid process of temporal bone and lateral 1/2 of superior nucal line
Sternal head: anterior surface of manubrium of sternum
Clavicular head: medial 1/3 of clavicle
Spinal accessory n CN XI
Unilaterally tilts the head to the same side, contralateral rotation
Bilateral: extends neck at atlantooccipital joint
Extends superior cervical
Flexes inferior cervical vertebrae
Assists in pump handle movement for deep respiration
Mylohyoid
Mylohyoid line of mandible
Mylohyoid raphe and body of hyoid
Nerve to mylohyoid, a branch of inferior alveolar n
CN V3 mandibular n
Elevates hyoid, floor of mouth, tongue during swallowing
Geniohyoid
Inferior mental spine of mandible
Body of hyoid
Hypoglossal n (CN XII)
Pulls hyoid anterosuperiorly, shortens floor of mouth, widens pharynx
Stylohyoid
Styloid process of temporal bone
Body of hyoid
Stylohyoid branch of facial n (CN VII)
Elevates and retracts hyoid
Digastric
Anterior belly: digastric fossa of mandible
Posterior belly: mastoid notch of temporal bone
Intermediate tendon to body and greater horn of hyoid
Ant belly: CN V3
Post belly: CN VII
Elevates hyoid during deglutition, depresses mandible against resistance
Sternohyoid
Manubrium and medial end of clavicle
Body of hyoid
Cervical anterior rami
Depresses hyoid after deglutition
Omohyoid
Superior border of scapula
Inferior border of hyoid
Cervical anterior rami
Depresses and retracts hyoid
Attaches to intermediate tendon/ sling
Sternothyroid
Posterior surface of manubrium
Oblique line of thyroid cartilage
CAR
depresses hyoid and larynx
Thyrohyoid
Oblique line of thyroid cartilage
Inferior border of body and greater horn of hyoid
CN XII hypoglossal n
Depresses hyoid and elevates larynx
Scalenes
Anterior C3-C6 transverse process
Middle C5-C7 transverse
Attach to the first rib
CAR
Bilateral cervical flexion
Unilateral: ipsilateral cervical sidebending, contralateral rotation
Carotid sheath
CVI
Common carotid artery (medial)
Vagus n
Internal jugular vein (lateral)
Psoas mj
Transverse processes of lumbar vertebrae- sides of bodies and IVD of T12-S1
Lesser trochanter of the femur
Lumbar plexus anterior branches of n L2-L4
Acting inferiorly with iliacus, flexes thigh
Acting superiorly, flexes vertebral column laterally to balance trunk
When sitting, acts inferiorly w iliacus to flex trunk
Iliacus
Superior 2/3 of iliac fossa, ala of sacrum, anterior sacroiliac ligaments
Lesser trochanter of femur, and shaft inferior to it and psoas mj tendon
Femoral n L2-L4
Flexes thigh, stabilizes hip joint, acts w psoas mj
Quadratus lumborum
Medial 1/2 of inferior border of 12th rib & tips of lumbar transverse processes
Iliolumbar ligament and internal lip of iliac crest
Anterior branches of T12&L1-L4 n
Extends and laterally flexes vertebral column
Fixes 12th rib during inspiration
External oblique
External surfaces of 5th-12th ribs
Linea alba, pubic tubercle, anterior 1/2 of iliac crest
Thoracoabdominal n
Subcostal n
Compress and support abdominal viscera
Flex and rotate trunk
Internal oblique
Thoracolumbar fascia, anterior 2/3 of iliac crest, connective tissue deep to inguinal ligament
Inferior borders of 10th-12th ribs, linea alba, pubis
Thoracoabdominal n
Subcostal n
First lumbar n
Compress and support abdominal viscera
Flex and rotate trunk
Transversus abdominis
Internal surfaces of 7th-12th costal cartilages, thoracolumbar fascia, iliac crest, inguinal ligament
Linea alba with aponeurosis of internal oblique, pubic crest, pubis
Thoracoabdominal n
Subcostal n
First lumbar n
Compress and support abdominal viscera
Rectus abdominis
Pubic symphysis and pubic crest
Xiphoid process and 5th-7th costal cartilages
Thoracoabdominal and subcostal n
Flexes trunk (lumbar vertebrae) Compresses abdominal viscera Stabilizes and controls tilt of pelvis (antilordosis)
External intercostal
Inferior border of ribs
Superior border of ribs below
Intercostal n
Elevate ribs during forced inspiration
Internal intercostal
Superior border of ribs
Inferior border of rib above
Intercostal n
Forced respiration, interosseous part depresses ribs, interchondral part elevates ribs
Serratus anterior
External surfaces of lateral parts of ribs 1-8
Anterior surface of the medial border of the scapula
Long thoracic n
Protracts the scapula and holds it against the thoracic wall
Rotates the scapula superiorly
Subclavius
Junction of 1st rib and it’s costal cartilage
Interior surface of middle 1/3 of clavicle
N to subclavius
Anchors and depresses clavicle
Pectoralis major
Clavicular head: anterior surface of medial 1/2 of clavicle
Sternocostal head: anterior surface of sternum, superior 6 costal cartilages, aponeurosis of external oblique
Lateral lip of the intertubercular groove of the humerus
Crest of the greater tubercle
Lateral and medial pectoral n
Adducts and medically rotates the shoulder joint
Draws the scapula anteriorly and inferiorly
Clavicular head flexes shoulder joint and sternocostal extends from a flexed position
Diaphragm
Back of the sternum, inside of costal arch, around to the tip of the 12th rib
Phrenic n
When contracting, whole muscle and central tendon moves down, expanding lungs as causing us to breathe
Anterior triangle
Midline of neck anteriorly
SCM posteriorly
Contains Supra and infrahyoid muscles
Posterior triangle
SCM anteriorly
Upper trapezius posteriorly
Clavicle inferiorly
Spinal accessory n Branches of cervical plexus Roots and trunks of racial plexus Phrenic n Subclavian artery Inferior belly of omohyoid All 3 scalenes Levator scapula Splenius cervicis capitus
Pectoralis minor
3rd-5th ribs near costal cartilages
Coracoid process of scapula
Medial pectoral n
Stabilizes scapula by drawing it inferiorly and anteriorly against thoracic wall
Downward rotation of scapula
