Muscles of the Abdomen Flashcards
What is the origin of the m. obliquus externus abdominus?
Ribs
What is the insertion of the m. obliquus externus abdominus?
Brim of pelvis, linea alba, tuber coxae
What is the function of the m. obliquus externus abdominus?
Compress abdominal viscera (runs ventral –> caudal)
What is the origin of the linea alba?
Base of xiphoid process
What is the insertion of the linea alba?
Prepubic tendon
What is the function of the linea alba?
Dense collagenous band found on the ventral midline of the abdominal wall
What is the origin of the m. obliquus internus abdominus?
Tuber coxae and transverse processes of the lumbar vertebrae
What is the insertion of the m. obliquus internus abdominus?
Linea alba, caudal ribs, brim of pelivs
What is the function of the m. obliquus internus abdominus?
Compress abdominal viscera; forms cremaster muscle of the spermatic cord (holds testes); runs ventral –> cranial
What is the origin of the m. transversus abdominus?
Caudal ribs, lumbar vertebrae
What is the insertion of the m. transversus abdominus?
Linea alba
What is the function of the m. transversus abdominus?
Compress the abdominal viscera
What is the origin of the m. rectus abdominus?
Costal cartilage and sternum
What is the insertion of the m. rectus abdominus?
Pubis via the prepubic tendon
What is the function of the m. rectus abdominus?
Compress abdominal viscera, flex spine
What is the origin of the m. cremaster?
M. obliquus internus abdominus
What is the insertion of the m. cremaster?
Vaginal tunic
What is the function of the m. cremaster?
Pulls testes towards or away from the body for the purpose of temperature regulation
What is the origin of the prepubic tendon?
Cranial border of the pubis
What is the insertion of the prepubic tendon?
M. rectus abdominus, m. oblique abdominal, and m. gracilis
What is the function of the prepubic tendon?
Strong, thick fibrous structure that relates to the rectus abdominus
