1 - Zill - Muscles of Back Lecture Flashcards
How is the scapula attached to the body?
Free floating, attached to vertebrae by muscles
Only bony link clavicle
Most frequent broken bone in body
Clavicle
Accessory Nerve (Cranial Nerve XI) Test
Shrug shoulders (traps)
Thoracolumbar (Lumbar) Fascia
Covers deep muscles of back
Attaches medially to spines of vertebrae, inferiorly to ilium
What is the role of the orientation of collagen fibvers in the Thoracolumbar (Lumbar) Fascia?
Origin helps support body weight when lift opposite leg
What do the Thracolumbar Fascia crossings serve as landmark for?
L5 Spinous Process
Triangle of Auscultation
Medial to scapular
Boundaries:
Inferior - Lats
Superior - Traps
Lateral - Rhomboid Major
Overlies 6th Intercostal Space
Floor no large muscles, good place to listen with stethoscope
Movement of Ribs in Respiration?
Lifting Ribs = Expands Thorax = Breath In (Inspiration)
Lower Ribs = Shrinks Thorax = Breath Our (Expiration)
What muscles move the ribs for respiration?
Levatores Costarum/Serratus Posterior Superior = Lift Up = Expand Thorax (breath in)
Serratus Posterior Inferior = Lower Rips = Shrink Thorax (breath out)
Dorsal Ramus
(Dorsal primary ramus)
Sensory and motor axons to regions of back, sensory to skin of back and posterior neck, motor axons to deep muscles of back and neck
Sensory Innervation of Back?
Dorsal Primary rami
Erector Spinae muscles / locations
Spinalis - most medial
Longissimus - intermediate
Iliocostalis - most lateral
Spinalis origin
Spinous process to spinous process
Longissimus Origin
Tranverse Process to transverse process
Iliocostalis Origin
Ilium and ribs to ribs or transverse process above
