Chapter 10 - Section 10.5 - Study Guide - Assess Your Learning Outcomes - Page 372: 5

The muscles in the medial compartment of the thigh, which includes the adductor brevis, adductor longus, adductor magnus, gracilis, and pectineus muscles: 1. **Adductor Brevis:** - **Location:** Adductor brevis is a triangular muscle located in the medial compartment of the thigh. - **Origin:** It originates from the inferior ramus of the pubis and the inferior ramus of the ischium (the two lower parts of the hip bone). - **Insertion:** The muscle inserts onto the linea aspera of the femur, a ridge on the posterior surface of the thigh bone. - **Function:** Adductor brevis primarily functions to adduct the thigh, bringing it toward the midline of the body. It also assists in hip flexion and stabilization of the hip joint. 2. **Adductor Longus:** - **Location:** Adductor longus is a long, slender muscle situated in the medial compartment of the thigh. - **Origin:** It originates from the pubic bone, specifically the superior pubic ramus. - **Insertion:** The muscle inserts onto the linea aspera of the femur. - **Function:** Adductor longus is responsible for adducting the thigh, helping to draw it toward the midline of the body. It also plays a role in hip flexion. 3. **Adductor Magnus:** - **Location:** Adductor magnus is a large muscle in the medial compartment of the thigh with both adductor and hamstring components. - **Origin:** It originates from various locations, including the inferior pubic ramus, the ischial tuberosity (the "sitting bone"), and the linea aspera of the femur. - **Insertion:** The muscle has multiple insertion points, including the linea aspera and the adductor tubercle of the femur. - **Function:** Adductor magnus primarily functions to adduct the thigh. It is one of the most powerful muscles in the thigh and also assists in hip extension. 4. **Gracilis:** - **Location:** Gracilis is a long, slender muscle located in the medial compartment of the thigh. - **Origin:** It originates from the pubic bone, near the pubic symphysis. - **Insertion:** The muscle inserts onto the medial surface of the tibia, just below the knee joint. - **Function:** Gracilis primarily functions to adduct the thigh and assists in flexing the knee joint. It is also involved in stabilizing the knee during walking and running. 5. **Pectineus:** - **Location:** Pectineus is a flat, quadrangular muscle located near the hip joint. - **Origin:** It originates from the pectineal line of the pubic bone. - **Insertion:** The muscle inserts onto the pectineal line of the femur. - **Function:** Pectineus assists in adducting the thigh, flexing the hip joint, and stabilizing the hip during movements. These muscles of the medial compartment of the thigh work together to perform actions like thigh adduction, hip flexion, and stabilization of the hip joint, contributing to the overall functionality of the lower limb.

The muscles in the medial compartment of the thigh, which includes the adductor brevis, adductor longus, adductor magnus, gracilis, and pectineus muscles: 1. **Adductor Brevis:** - **Location:** Adductor brevis is a triangular muscle located in the medial compartment of the thigh. - **Origin:** It originates from the inferior ramus of the pubis and the inferior ramus of the ischium (the two lower parts of the hip bone). - **Insertion:** The muscle inserts onto the linea aspera of the femur, a ridge on the posterior surface of the thigh bone. - **Function:** Adductor brevis primarily functions to adduct the thigh, bringing it toward the midline of the body. It also assists in hip flexion and stabilization of the hip joint. 2. **Adductor Longus:** - **Location:** Adductor longus is a long, slender muscle situated in the medial compartment of the thigh. - **Origin:** It originates from the pubic bone, specifically the superior pubic ramus. - **Insertion:** The muscle inserts onto the linea aspera of the femur. - **Function:** Adductor longus is responsible for adducting the thigh, helping to draw it toward the midline of the body. It also plays a role in hip flexion. 3. **Adductor Magnus:** - **Location:** Adductor magnus is a large muscle in the medial compartment of the thigh with both adductor and hamstring components. - **Origin:** It originates from various locations, including the inferior pubic ramus, the ischial tuberosity (the "sitting bone"), and the linea aspera of the femur. - **Insertion:** The muscle has multiple insertion points, including the linea aspera and the adductor tubercle of the femur. - **Function:** Adductor magnus primarily functions to adduct the thigh. It is one of the most powerful muscles in the thigh and also assists in hip extension. 4. **Gracilis:** - **Location:** Gracilis is a long, slender muscle located in the medial compartment of the thigh. - **Origin:** It originates from the pubic bone, near the pubic symphysis. - **Insertion:** The muscle inserts onto the medial surface of the tibia, just below the knee joint. - **Function:** Gracilis primarily functions to adduct the thigh and assists in flexing the knee joint. It is also involved in stabilizing the knee during walking and running. 5. **Pectineus:** - **Location:** Pectineus is a flat, quadrangular muscle located near the hip joint. - **Origin:** It originates from the pectineal line of the pubic bone. - **Insertion:** The muscle inserts onto the pectineal line of the femur. - **Function:** Pectineus assists in adducting the thigh, flexing the hip joint, and stabilizing the hip during movements. These muscles of the medial compartment of the thigh work together to perform actions like thigh adduction, hip flexion, and stabilization of the hip joint, contributing to the overall functionality of the lower limb.