Trunk muscles Flashcards
What muscle is situated on the lateral and anterior parts of the abdomen?
external abdominal oblique
What is the largest and most superficial of the 3 flat muscles?
external abdominal oblique
What is the origin of the external abdominal oblique
anterior iliac crest, public bone, linea alba
What is the insertion of the external abdominal oblique
lower 8 ribs
The upper and middle fibres of external abdominal oblique are directed __________ and ________ and ends in an ______________
The upper and middle fibres of external abdominal oblique are directed DOWNWARD and FORWARD and ends in an APONEUROSIS
Describe the aponeurosis of the external oblique
thin and strong membrane structure joined with that of the opposite muscle along the midline
What are the functions of the external oblique
-lateral flexion of trunk @ spinal joints, contralateral rotation of the trunk @ spinal joints, flexion of trunk @ spinal joints, posterior pelvic tilt, compresses abdominal contents
What is the innervation of the external oblique
intercostal nerves (T7-T12 + L1)
True or false: the internal abdominal oblique is thicker and larger than the external oblique
false: thinner and smaller than external oblique
What muscle is deep to the external oblique
internal oblique
What shape is the internal oblique
irregularity quadlateral form
Where is the internal oblique situated
at lateral and anterior parts of abdomen
What is the origin of the internal oblique?
inguinal ligament, anterior portion of iliac crest, thoracolumbar fascia
What is the insertion of the internal oblique
linea alba, lower 3 ribs
What are the functions of the internal oblique
lateral flexion of trunk @ spinal joints, ispilateral flexion of trunk @ spinal joints, flexion of trunk @ spinal joints, posterior pelvic tilt, compression of abdominal contents
What is the most internal of the 3 flat muscles?
transversus abdominis
What muscle lies directly deep to internal oblique
transversus abdominis
What nerve innervates the internal oblique
intercostal nerves T7-T12 + L1
What is the origin of the transversus abdominis?
inguinal ligament, iliac crest, thoracolumbar fascia, cartilages of lower 6 ribs
What is the insertion of the transversus abdominis
linea alba
What are the functions of the transversus abdominis
compression abdominal contents
What is the innervation of the transversus abdominis
intercostal nerves of T7-T12 + L1
What is the long and flat muscles that extends along the whole length of the front of the abdomen?
rectus abdominis
What separates the R rectus abdominis from the L?
linea alba
What is the origin of the rectus abdominis
pubic crest, symphysis pubis
What is the insertion of the rectus abominis
xiphoid process, cartilages of ribs 5-7
What are tendinous intersections?
the rectus abdominis being crossed by fibrous bands, three in number
What encloses the rectus abdominis
rectus sheath
What are the functions of the rectus abdominis
flexion of trunk @ spinal joints, posterior pelvic tilt, compresses abdominal contents
What is the innervation of the rectus abdominis
intercostal nerves T5- T12
What are the two major groups of muscles in the back?
extrinsic back muscles and intrinsic back muscles
The extrinsic back muscles are divided into what sub groups?
superficial and intermediate
The intrinsic back muscles are divided into what subgroups?
superficial, intermediate, deep, and segmental
What group of muscles is related to and involved in movements of the upper limbs?
superficial extrinsic back muscles
What muscles are included in the superficial extrinsic back muscles?
trapezius, latissimus dorsi, levator scapulae, rhomboids
What muscle group of attached to the ribs and may serve a respiratory function?
intermediate extrinsic back muscles
What muscles are included in the intermediate extrinsic back muscles?
serratus posterior superior, serratus posterior inferior
What nerve innervates the extrinsic back muscles?
anterior (ventral) rami of spinal nerves (except trapezius)