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Lecture

Lecture Notes - W. Nov 28

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Department
Kinesiology & Health Science
Course
KINE 2031
Professor
All Professors
Semester
Fall

Description
Lecture – November 28, 2013 Trunk Muscles Intercostals •Involved in inspiration and expiration •Protection of the underlying organs •Two sets Abdominals •Muscles on the anterior posterior •Quite a distance from the bone •Stability to the vertebral column •Stabilizers o Ligaments (muscles) o The shape also a stabilizer o Lungs, if you take a deep breath and lock the air, it produces air sacks, it stabilizes the trunk and pelvic girdle o When you contract abdominal muscles, so all the inside of the organs in the abdominal are pushed back towards vertebral column, this stabilizes as well •Landmarks o Belly button - umbilicus o Abdominal aponeurosis • Flat, broad • Anterior side o Line that goes in the middle is called the linea alba • Separates the two sides o Inguinal ligament • Inferior side of the aponeurosis • Connection of between anterior superior iliac spine and the crest of the pubic bone • Inferior folding of the aponeurosis • Just below this is the femoral artery and vein • That is where you can take a femoral pulse • Demarcation of the truck to the thigh Abdominal muscles •Three layers (External oblique, internal oblique, transversus abdominus and rectus abdominus) •Functions: o Move the trunk with the pelvic girdle o Stabilize vertebral column o Protect underline tissues •External oblique o Fiber direction, same as the fingers in pocket o Function: Flexion of the trunk, lateral flexion and rotation •Internal oblique o Fiber direction is perpendicular to external o Together creates a mesh (similar to intercostal) o Has an abdominal sheet o Function - trunk flexion, lateral flexion and rotation (opposite side to the muscle) • Internal oblique on the right side contracts, you rotate to the left • They help to maintain the shape, compress abdominal organs, and if you have fat you will have a protrusion • Inner is called the transversus abdominus o Create mesh protective purposes o Runs from the lumbar dorsal all the way across the linea alba, joins with the another side o Horizontal fiber direction o Function: doesn't move upper torso (no lateral flexion or flexion) • It can minimally rotate belly button area o When it contracts, squeezes the abdominal organs o All it is involved in compression and protection of the abdominal organs • Rectus abdominis muscle o Long strap like muscle on the anterior part of the abdomen o Six pack appearance o From Pubis bone to the xiphoid process o Powerful flexors of the trunk o This muscle is segmented • Muscle that is very long, can do a create deal of movement but can't produce a lot of force • BUT your abdominal is very important, thus it must produce a lot of force • Therefore there series of short muscles  Best of both worlds, it is long muscle (range of movement a lot) and powerful muscle o It is important to have strong abbs o Ripped appearance for weight lifters o Sections can be 4 or 3 (8 pack vs. 6 pack) Abdominal Muscles • Horizontal cross section • When you suck in the belly - is the transverse abdominals which contributes to it o Yes, as well as the rectus abdominus muscle
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