The total number of ligamentuni denticulatum lies on side of spinal cord are
**Core Concept**
The ligamentum denticulatum, also known as the denticulate ligament, is a fibrous structure that connects the spinal cord to the dura mater, providing stability and support to the spinal cord within the spinal canal. It plays a crucial role in maintaining the integrity of the spinal cord and is an important anatomical landmark for neurosurgeons and neurologists.
**Why the Correct Answer is Right**
The ligamentum denticulatum is composed of a series of transverse and longitudinal fibers that attach to the pia mater, a delicate membrane covering the spinal cord. These fibers are arranged in a denticulate (tooth-like) pattern, hence the name. The correct number of ligamenta denticulata on each side of the spinal cord is 21, with 7 transverse and 14 longitudinal fibers. This arrangement provides a unique and effective mechanism for stabilizing the spinal cord and preventing excessive movement or damage.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the correct number of ligamenta denticulata on each side of the spinal cord. The incorrect number would lead to confusion and misinterpretation of the anatomy.
**Option B:** This option is incorrect because it fails to identify the correct arrangement of the ligamenta denticulata, specifically the number of transverse and longitudinal fibers.
**Option C:** This option is incorrect because it does not provide a specific number of ligamenta denticulata on each side of the spinal cord, making it a vague and unhelpful answer.
**Clinical Pearl / High-Yield Fact**
In neurosurgical procedures, knowledge of the ligamentum denticulatum is essential for surgeons to avoid damaging the spinal cord during dissection or retraction. Understanding the anatomy of the ligamentum denticulatum can help minimize complications and ensure optimal patient outcomes.
**Correct Answer:** C. 21