Canine Abdominal Muscle Anatomy Quiz & Flashcards

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Questions and Answers

What is the origin of the external abdominal oblique muscle?

Ribs 4-13 and thoracolumbar fascia (correct)

Ribs 1-3 and thoracolumbar fascia

Costal arch, rectus abdominis, and linea alba

Tuber coxae, thoracolumbar fascia and inguinal ligament

What is the action of the external abdominal oblique muscle in relation to the vertebral column?

Rotation of the vertebral column

Extension of the vertebral column

Stabilization of the vertebral column

Flexion of the vertebral column (correct)

What is the insertion of the external abdominal oblique muscle?

Costal arch and rectus abdominis

Prepubic tendon and inguinal ligament

Tuber coxae and thoracolumbar fascia

Linea alba by a wide aponeurosis (correct)

What is the direction of the fibers of the internal abdominal oblique muscle?

Cranioventrally Signup and view all the answers

What is the origin of the internal abdominal oblique muscle?

Tuber coxae, thoracolumbar fascia and inguinal ligament Signup and view all the answers

What is the common innervation of the muscles of the abdominal walls?

Ventral branches of thoracic and lumbar spinal nerves Signup and view all the answers

What is the fiber orientation of the external abdominal oblique m?

Caudoventrally Signup and view all the answers

What is the function of the external abdominal oblique muscle in relation to respiration?

Aids in expiration Signup and view all the answers

What is the main function of the abdominal muscles?

To facilitate breathing and defecation Signup and view all the answers

Which of the following structures is NOT part of the abdominal wall layers?

Scapula Signup and view all the answers

What is the purpose of the inguinal canal (for males specifically).

To house the spermatic cord in males Signup and view all the answers

What is the name of the structure that forms the boundary of the inguinal canal?

Superficial inguinal ring Signup and view all the answers

What is the primary function of the cremaster muscle?

To pull the testis closer to the body in response to cold Signup and view all the answers

What is the origin of the cremaster muscle?

Caudal border of the internal abdominal oblique Signup and view all the answers

What is the innervation of the cremaster muscle?

Genitofemoral nerve Signup and view all the answers

What is the significance of the inguinal canal in clinical importance?

Neutering, cryptorchidism, and inguinal hernias Signup and view all the answers

What is the structure that contains the spermatic cord in males?

Vaginal tunic Signup and view all the answers

What is the feminine counterpart of the vaginal tunic?

Vaginal process Signup and view all the answers

What is the anatomical structure that courses through the superficial inguinal ring? (Hint: noted in males)

Cremaster muscle Signup and view all the answers

Which of the following structures is NOT present in the inguinal canal (for both males and females)?

Pudendal nerve Signup and view all the answers

What forms the rectus sheath?

Aponeuroses of the external and internal abdominal oblique muscles and transversus abdominis muscle Signup and view all the answers

What is the clinical importance of the rectus sheath?

It is the holding layer when closing the abdomen Signup and view all the answers

What is the linea alba?

A midventral raphe where the aponeuroses of the left and right abdominal muscles meet Signup and view all the answers

What is the inguinal ligament?

A ligament that separates the inguinal canal from the vascular lacuna Signup and view all the answers

What is the caudal limit of the aponeurosis of the external abdominal oblique muscle?

The inguinal ligament Signup and view all the answers

What is the prepubic tendon?

A tendon that attaches the abdominal muscles to the pelvis Signup and view all the answers

What is the function of the aponeuroses of the external and internal abdominal oblique muscles and transversus abdominis muscle?

They form the rectus sheath Signup and view all the answers

What is the superficial inguinal ring?

The opening of the inguinal canal Signup and view all the answers

The abdomen is divided into three main regions. What are they? (State in order)

Cranial, middle and caudal abdominal regions Signup and view all the answers

What region(s) make up the cranial abdomen?

Xiphoid and hypochondriac region Signup and view all the answers

What regions make up the middle abdominal topographic region?

Umbilical and lateral abdominal region Signup and view all the answers

What regions make up the caudal abdominal region?

Pubic region and Inguinal region Signup and view all the answers

Match the direction of the fibers to it’s correct muscle

External abdominal oblique m = Caudoventrally Internal Abdominal oblique m. = Cranioventrally Transversus abdominis m. = Transversely Rectus abdominis m. = Longitudinally Signup and view all the answers

Match insertion to correct muscles

External abdominal oblique m. = Linda alba by a wide aponeurosis Internal abdominal oblique muscle = Costal arch, rectus abdominus, linea alba, and pre pubic tendon Transversus abdominis m. = Linea alba Rectus abdominis m. = First costal cartilage and sternum and pelvis by way of pre pubic tendon Signup and view all the answers

Match the origins to correct muscle

External abdominal oblique = Ribs 4-13 and thoracolumbar fascia Internal abdominal oblique muscle = Tuber coxae, thoracolumbar fascia and Inguinal ligament Transversus abdominis m = Medial surfaces of rib 9-13 and transverse process of the lumbar vertebrae Rectus abdominis m. = First costal cartilage and sternum and pelvis by way of pre pubic tendon Signup and view all the answers

Which muscle of the abdominal wall is the deepest abdominal muscle?

Transversus abdominis m. Signup and view all the answers

What 3 borders make up the deep Inguinal ring?

The cranial, medial and latero-caudal border make up the deep Inguinal ring. Signup and view all the answers

What muscle participates/contributes to the cranial border of the deep Inguinal ring?

Caudal border of internal abdominal oblique m. Signup and view all the answers

The ___________ m. is the muscle considered to be the medial border that contributes to forming the deep Inguinal ring

Rectus abdominus Signup and view all the answers

The _____________ is considered the latero-caudal border that participates in forming the deep Inguinal ring.

Inguinal ligament Signup and view all the answers

What 3 structures make up the deep Inguinal ring?

The rectus abdominis m. , the internal abdominal oblique m and the Inguinal ligament Signup and view all the answers

What feature/characteristic makes the superficial Inguinal ring distinct?

It’s covered by thoracolumbar fascia Signup and view all the answers

Study Notes

Abdominal Wall and Muscles

The abdominal wall consists of four layers: external abdominal oblique muscle, internal abdominal oblique muscle, transversus abdominis muscle, and rectus abdominis muscle.
The muscles of the abdominal wall function to compress the abdominal viscera, aid in expiration, urination, and defecation, and flex the vertebral column.

External Abdominal Oblique Muscle

Origin: ribs 4-13 and thoracolumbar fascia
Insertion: linea alba by a wide aponeurosis
Innervation: ventral branches of thoracic and lumbar spinal nerves
Action: compression of the abdominal viscera, aids in expiration, urination, defecation, parturition, and flexion of the vertebral column

Internal Abdominal Oblique Muscle

Location: medial to the external abdominal oblique muscle
Fiber direction: cranioventrally
Origin: tuber coxae, thoracolumbar fascia, and inguinal ligament
Insertion: costal arch, rectus abdominis, linea alba, and prepubic tendon
Innervation: ventral branches of thoracic and lumbar spinal nerves
Action: compression and support of the abdominal viscera

Rectus Sheath

Formed by aponeuroses of the external abdominal oblique muscle, internal abdominal oblique muscle, and transversus abdominis muscle
Clinical importance: the holding layer when closing the abdomen

Linea Alba

Midventral raphe (seam) where the aponeuroses of the left and right abdominal muscles meet
A thick, white, fibrous structure that runs from the xiphoid process to the pubic symphysis

Inguinal Ligament

Separates the inguinal canal from the vascular lacuna
Caudal limit of the aponeurosis of the external abdominal oblique muscle

Superficial Inguinal Ring

Formed by the aponeurosis of the external abdominal oblique muscle
Contains the spermatic cord, cremaster muscle, and vaginal process

Prepubic Tendon

Strong attachment of abdominal muscles to the pelvis
Contains several structures: external pudendal artery and vein, genitofemoral nerve, lymphatics, and the vaginal process (in females)

Inguinal Canal

Clinical importance: neutering, cryptorchidism, and inguinal hernias

Cremaster Muscle

Origin: caudal border of the internal abdominal oblique muscle
Innervation: genitofemoral nerve
Action: pulls the testis closer to the body in response to cold

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Description

This quiz covers the external and internal abdominal oblique muscles in canine anatomy, including their location and functions.

Anatomy of Canine Abdominal Oblique Muscles

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