Understanding the Sacrum Anatomy

This video tutorial provides a comprehensive overview of the sacrum, a large triangular bone at the base of the spine. It covers the sacrum's anatomy, including its base, apex, and surfaces, and explains its role in the vertebral column and pelvis. The video also details the sacral canal and the various muscle and ligament attachments. A mnemonic is provided to help remember these attachments, making it easier for students to recall the information.

What is the sacrum primarily formed by?

• Fusion of five thoracic vertebrae

• Fusion of five lumbar vertebrae

• Fusion of five sacral vertebrae

• Fusion of five coccygeal vertebrae

Which joint does the base of the sacrum articulate with?

• Thoracolumbar joint

• Lumbosacral joint

• Sacroiliac joint

• Coccygeal joint

What is the sacral promontory?

• The inferior margin of the sacrum

• The posterior margin of the sacrum

• The lateral margin of the sacrum

• The anterior margin of the sacrum

How many transverse ridges are present on the pelvic surface of the sacrum?

• Five

• Three

• Two

• Four

What is the sacral hiatus?

• A gap in the anterior wall of the sacral canal

• A gap in the posterior wall of the sacral canal

• A gap in the superior wall of the sacral canal

• A gap in the lateral wall of the sacral canal

What shape is the articular surface on the upper part of the lateral surface of the sacrum?

• U-shaped

• T-shaped

• V-shaped

• L-shaped

What does the sacral canal contain?

• Intervertebral discs

• Nerve roots only

• Cerebrospinal fluid

• Spinal meninges and filum terminale

Which muscle originates from the rough part of the ala of the sacrum?

• Piriformis

• Gluteus maximus

• Erector spinae

• Iliacus

Which ligament is attached to the inferior lateral angle of the sacrum?

• Interosseous sacroiliac ligament

• Ligamentum flavum

• Lateral sacrococcygeal ligament

• Anterior longitudinal ligament

What mnemonic is used to remember the attachments on the sacrum?

• He was Taurus I love costly and good apple milkshake

• He was Taurus I love cheap and good apple pie

• He was Taurus I love costly and bad apple milkshake

• He was Taurus I love cheap and bad apple pie