Lecture 6 Flashcards
External obliques: origin
ribs 5-12
External obliques: insertions (3)
linea alba, iliac crest, pubic crest
External obliques: actions (bilateral and unilateral)
Bilateral: contraction: flexion of the vertebral column; abdominal compression
Unilateral: contraction: lateral flexion; trunk rotation (contralateral side)
Internal obliques: origin (2)
thoracolumbar fascia, iliac crest
Internal obliques: insertions (3)
linea alba, pubis, inferior ribs & costal cartilage
Internal obliques: actions
same as external oblique except: rotation to ipsilateral (same) side
Rectus abdominis: origin
pubic symphysis
Rectus abdominis: insertion (2)
xiphoid process, costal cartilage of ribs 5-7
Rectus abdominis: actions (2)
flexion of the trunk, abdominal compression
what is the rectus abdominis seperated by?
linea alba
what are the horizontal fibrous bands that seperate rectus abdominus into segments called?
tendious intersections
Transverse abdominus: origins (3)
costal cartilage of inferior ribs, iliac crest, thoracolumbar fascia
Transverse abdominus: insertions (2)
linea alba, pubis
Transverse abdominus: action
abdominal compression
what is the rectus sheath?
formed by aponeurosis (cheet-like tendon by which muscles connect to bone or fascia) of external & internal obliques and transverse abdominis
encloses rectus abdominis
ceonverge at linea alba
Trapezius: origins (2)
occipital bone of the skull, spinous processes of the thoracci vertebrae (T1-T12)
Trapezius: insertion
scapula (acromion and scapular spine); lateral aspect of clavicle
Trapezius: sections
upper, middle, lower
Trapezius: actions (upper, middle, lower)
upper: elevate scapula
middle: retract scapula & upward rotation of scapula (arm abduction)
lower: depress scapula (arm abduction)
Latissimus dorsi: origins (4)
spinous processes of lower thoracic vertebrae & lumbar vertebrae (T6-L5), sacrum, iliac crest, thoracolumbar fascia
Latissimus dorsi: insertion
humerus (intertubercular groove)
Latissimus dorsi: actions (3)
adduction of arm, extension of arm, medial rotation of arm at shoulder
Latissimus dorsi: innervation
thoracodorsal nerve (bracial plexus)
Levator scapulae: origin
transverse processes superior cervical vertebrae (C1-C4)
Levator scapulae: insertion
superior/medial border of scapula
Levator scapulae: action
elevation of the scapula
Levator scapulae: innervation
dorsal scapular nerve (brachial plexus)
Rhomboids (major and minor): origin
spinous processes of C7-T5)
Rhomboids (major and minor): insertion
medial border of the scapula
Rhomboids (major and minor): actions (2)
retraction of the scapula, downward rotation of the scapula (arm adduction)
Rhomboids (major and minor): innervation
dorsal scapular nerve (brachial plexus)
Teres major: origin
inferior angle of scapula, posterior aspect
Teres major: insertion
medial lip of intertubercular groove
Teres major: actions (3)
adduction of arm, extension of arm, internal rotation of arm
Teres major: innervation
lower subscapular nerve (brachial plexus)
Eretor spinae muscles: 3 paired longitudinal muscles
Lateral –> medial
iliocostalis, longissimus, spinalis (I Like Standing)
Eretor spinae muscles: actions (bilateral, unilateral)
bilateral contraction: extension of the vertebral column
unilateral contraction: lateral flexion of the vertebral column
