Muscles of Thorax, Abdominal Wall, and Pelvis

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Anatomy & Physiology 1 Flashcards on Muscles of Thorax, Abdominal Wall, and Pelvis, created by Mansi Trikha on 05/12/2017.
Mansi Trikha
Flashcards by Mansi Trikha, updated more than 1 year ago
Mansi Trikha
Created by Mansi Trikha over 6 years ago
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Resource summary

Question Answer
external intercostals (vertebral column to costachondral junction) Origin: Inf. Border of rib above Insertion: Sup. Border of rib below Action: Elevate rib cage (inspiration)
internal intercostals (sternum to angle of ribs) Origin: Sup. Border of rib below Insertion: Inf. Border of rib above Action: Depress rib cage (expiration)
thoracic diaphragm (floor of thoracic cavity) Origin: Inf. Border of rib cage and sternum Insertion: Central tendon Action: Prime mover of inspiration: Flattens and enlarges dimensions of thorax
rectus abdominis (pubic crest to xyphoid process) [covered w/ sheath] Origin: Pubic crest and symphysis Insertion: Xiphoid process and costal cartilages Action: Flex lumbar region of vertebral column
External oblique (outer surfaces of lower 8 ribs to linea alba) Origin: Outer surfaces of lower 8 ribs Insertion: Linea alba Action: Jointly: flex vertebral column; Individually: rotation and lateral flexion
Internal oblique (iliac creasr to cartilage of lower 3 ribs, linea alba and pubic bone) Origin: Fascia connecting to lumbar spine; iliac crest Insertion: Linea alba, pubic crest, last 3 ribs Action: Jointly: flex vertebral column; Individually: rotation and lateral flexion
Tansverse abdominis (horizontal from 6 lower ribs, lumbar vertebrae, iliac crest to linea alba and pubic bone) Origin: Inguinal ligament; fascia connecting to lumbar spine; iliac crest, last 6 ribs Insertion: Linea alba; pubic crest Action: Compress abdominal cavity
Pelvic diaphragm (muscles closing pelvic outlet) Levator ani Coccygeus
Urogenital diaphragm Deep transverse perineus
superficial space i. Ischiocavernosus ii. Bulbospongiosus iii. Superficial transverse perineus
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