1.2 The Muscles of the Anterior Abdominal Wall Flashcards
What are the 3 Flat Muscles which form part of the Antero-Lateral Abdominal Wall?
(Superficial to Deep)
- The External Oblique
- The Internal Oblique
- The Transverse Abdominis
What are the Actions of the External Oblique?
- Compress and Support the Viscera
2. Flex and Rotate the Trunk
What are the Actions of the Internal Oblique?
- Compress and Support the Viscera
2. Flex and Rotate the Trunk
What are the Actions of the Transverse Abdominis?
Compress and Support the Viscera
What is the innervation for the External Oblique?
The Anterior Rami of T7-T12:
- The Thoraco-Abdominal Nerves of T7 to T11
- The Sub-Costal Nerve - T12
What is the innervation for the Internal Oblique?
The Anterior Rami of T7-L1
- The Thoraco-Abdominal Nerves of T7 to T11
- The Sub-Costal Nerve - T12
- The First Lumbar Vertebrae - L1
What is the innervation for the Transverse Abdominis?
The Anterior Rami of T7-L1
- The Thoraco-Abdominal Nerves of T7 to T11
- The Sub-Costal Nerve - T12
- The First Lumbar Vertebrae - L1
What are the Longitudinal Muscles which form part of the Antero-Lateral Abdominal Wall?
- The Rectus Abdominis
2. Pyramidalis Muscle
What are the Actions of the Rectus Abdominis?
- Flexes the Trunk
- Compresses Viscera
- Controls the Tilt of the Pelvis
Superior to the Umbilicus, where does the Rectus Abominis lie?
Within the Rectus Sheath
Inferior to the Umbilicus, where does the Rectus Abdominis lie?
Deep to the Rectus Sheath
What is the Pyramidalis Muscle?
A small triangular muscle, anterior to the Rectus Abdominis, contained within the Rectus Sheath which Tenses the Linea Alba (The White Fibrous Tissue between the Xiphoid Process and the Pubic Symphysis).
What is the Rectus Sheath?
The Aponeurosis of the External Oblique, Internal Oblique, and Transverse Abdominis
What is an Aponeurosis?
A sheet of White Fibrous Tissue which takes the place of a Tendon, in Sheet-Like Muscles (having wider areas of attachments)
At what level is the position of the Umbilicus on the Abdominal Wall?
L3 / L4