Trunk Muscles Flashcards
Axilla
Armpit
What does the pectoral is major look like
Large and fan shaped
Location of intercostal muscles
Deep muscles between Ribs
Raises rib cage when inhaling normally
External intercostal muscles
Depresses rib cage when exhaling forcibly
Internal intercostal muscles
Origin and insertion of the rectus abdominis
The origin is the pubis and the insertion is the sternum and ribs five through seven
Flexes vertebral column
Rectus abdominis
Compresses abdominal contents during defecation and childbirth and are involved in forced breathing
Reclusive abdominus
What encloses the rectus abdominis
Aponeurosis
Location of external oblique
Origin is last 8 ribs and insertion is iliac crest of the ileum
Flexes the vertebral column and rotates the trunk and Bends It laterally
External oblique and internal oblique
Special function of external oblique
Forms lateral wall of abdomen
Location of internal oblique
Origin is iliac crest insertion is last three ribs
Source of lower back pain
Erector spinae
Forms anterior wall of Axilla
Pectoralis major
The fibers of the internal oblique run what to the external obliques
At right angles
Compresses abdominal contents
Transversus abdominis
Which way do the fibers of the transversus abdominis run
Horizontally
When both quadratus lumborum work together what occurs
Extension of the lumbar spine
Location of pectoralis major
Covers upper part of trunk
O: sternum, shoulder girdle, and first 6 ribs
I: proximal end of humerus
Location and origins and insertion of quadratic lumborum
Part of posterior abdominal wall the origin is the iliac crest in the insertion is the upper lumbar vertebrae specifically the transverse processes
Location, origin, and insertion of the latissimus Dorsi
Origin is the lower spine and ilium
Insertion is the proximal end of the humerus
Extends and adducts humerus
Latissimus Dorsi
Very important in a power stroke such as swimming
Latissimus Dorsi
Origin and insertion of deltoid
The origin is the scapular spine or clavicle and insertion is the proximal end of the humorous specifically the deltoid tuberosity
What does the latissimus Dorsi look like
2 large flat muscles
Where do you injectsmall amounts of medicine if needed into the muscles
Deltoid
Three origins and insertions of the erector spinae and location
O: iliac crest ribs three to twelve and vertebrae
I: ribs and thoracic and cervical vertebrae
Covers entire length of vertebral column
Prime mover of back extension
Erector spinae
Provides resistance that helps contract bending at waist
Erector spinae
Origin and insertion of transversus abdominis
The origin is the lower ribs and iliac crest and the insertion is the pubis
Each muscle of pair flexes the spine laterally
Quadratus lumborum
Prime mover of arm abduction
Deltoid
