Dominic Stone
The hamstrings are a group of three large muscles that run down the back of the thigh from the sit bones. The three muscles are the semitendinosus, the semimembranosus, and the biceps femoris. The biceps femoris is the outer muscle of the hamstring group and has two heads: one long and one short. The long head attaches to the inner side of the sit bones, while the short head attaches to the thigh bone in three places closer to the knee than the hip. The semitendinosus is a large, long muscle in the middle of the back of the thigh, and the semimembranosus is the most medial muscle. This introduction will explore how these muscles attach to the hamstrings.
| Characteristics | Values |
|---|---|
| Hamstring muscles | Semitendinosus, Semimembranosus, Biceps femoris |
| Biceps femoris attachments | Long head: inner side of sit bones; short head: femur in three places closer to the knee than the hip; lower leg at the head of the fibula (calf bone), outer condyle of the tibia (shin bone), and the fascia (connective tissue) of the leg |
| Semitendinosus attachments | Originates from the inside of the back of the thigh near the biceps femoris at the inner sides of the sitting bones; crosses the knee and connects to the inner side of the upper part of the shin bone; also attaches to the fascia of the leg |
| Semimembranosus attachments | Inserts on the inner portion of the shin bone |
Explore related products
What You'll Learn
- The biceps femoris muscle is the lateral (outer) muscle of the hamstring group
- The semitendinosus is a long hamstring muscle in the middle of the back of the thigh
- The semimembranosus is the most medial muscle
- The hamstrings attach to the sit bones (ischial tuberosities)
- The hamstrings include three separate muscles that work together
The biceps femoris muscle is the lateral (outer) muscle of the hamstring group
The hamstrings are made up of three separate muscles: the semitendinosus, the semimembranosus, and the biceps femoris. The biceps femoris muscle is the lateral (outer) muscle of the hamstring group. As its name implies, the biceps femoris has two heads: one long and one short. The long head of the biceps femoris attaches to the inner side of your sit bones, also known as the ischial tuberosity. The short head attaches to the femur (thigh bone) in three places closer to the knee than the hip. Both heads attach to the lower leg at the head of the fibula (calf bone), the outer (lateral) condyle of the tibia (shin bone), and the fascia (connective tissue) of the leg.
The biceps femoris muscle is located in the posterior compartment of the thigh, also known as the hamstrings. It runs from the ischial tuberosity to the proximal part of the fibula, crossing the hip and knee joints. The biceps femoris tendon joins with the lateral collateral ligament to insert at the lateral aspect of the head of the fibula.
The biceps femoris is responsible for thigh extension, knee flexion, and external rotation of both the hip and leg. It acts simultaneously on the hip and knee joints, allowing for flexion and external rotation at the knee joint, and extension and external rotation in the hip joint.
Walking's Impact on Muscle Glycogen: What You Need to Know
You may want to see also
Explore related products
The semitendinosus is a long hamstring muscle in the middle of the back of the thigh
The semitendinosus is a fusiform muscle of the posterior compartment of the thigh. It is so named because it has a very long tendon of insertion. The semitendinosus is the most medial muscle of the posterior compartment of the thigh. It originates from the inside of the back of the thigh near the biceps femoris at the inner sides of the sitting bones. It also crosses the knee and connects to the inner side of the upper part of the shin bone. It also attaches to the fascia of the leg. The semitendinosus extends the thigh backward and allows for the medial rotation (i.e., turning the lower extremity inward) of the thigh and knee joint.
The Muscular Nose: Fact or Fiction?
You may want to see also
Explore related products
The semimembranosus is the most medial muscle
The hamstrings are a group of three muscles that work together: the semitendinosus, the semimembranosus, and the biceps femoris. They run down the back of the thigh from the sit bones and attach to different points on the lower leg. The semimembranosus is the most medial of the three hamstring muscles in the thigh. It is so named because it has a flat tendon of origin. It lies posteromedially in the thigh, deep to the semitendinosus muscle. It extends the hip joint and flexes the knee joint. The semimembranosus muscle, so called from its membranous tendon of origin, is situated at the back and medial side of the thigh. It is wider, flatter, and deeper than the semitendinosus (with which it shares very close insertion and attachment points). The muscle overlaps the upper part of the popliteal vessels.
The semimembranosus is a relatively long muscle that spans the full length of the thigh – from the hip to the knee. It is a relatively large muscle that originates from a small facet on the rough superolateral surface of the ischial tuberosity. The tendon of semimembranosus appears at the level of the mid-thigh and continues caudally toward the point of insertion at the medial condyle of the tibia. The semimembranosus is deep to semitendinosus, superficial to adductor magnus and medial to biceps femoris along its entirety. The proximal part of the muscle is covered by gluteus maximus and medial to adductor minimus.
Building Muscles: Unlocking the Science of Strength Training
You may want to see also
Explore related products
The hamstrings attach to the sit bones (ischial tuberosities)
The semitendinosus is a large hamstring muscle that originates from the inside of the back of the thigh near the biceps femoris at the inner sides of the sitting bones. It also crosses the knee and connects to the inner side of the upper part of the shin bone. It also attaches to the fascia of the leg. The semitendinosus extends the thigh backward and allows for the medial rotation (i.e., turning the lower extremity inward) of the thigh and knee joint. The most medial muscle, the semimembranosus inserts on the inner portion of the shin bone.
The semimembranosus is another hamstring muscle that works together with the semitendinosus and the biceps femoris. The semimembranosus is a sheath-like tendon that gets its name from the fact that "semi" means half and "membranosus" means skin.
Diagnosing Muscle Tears: What Tests Reveal the Injury?
You may want to see also
Explore related products
The hamstrings include three separate muscles that work together
The semitendinosus is a long hamstring muscle in the middle of the back of the thigh. Its main functions are extending and rotating the hip and bending and internally rotating at the knee. The semitendinosus is attached to the medial (inner) side of the sit bones and divides into two sections by a visible ridge of tendonous tissue called a raphe. It runs down the middle of the back of the thigh, crosses to the inside of the knee, and attaches to the upper part of the tibia (shinbone). The semitendinosus joins with the sartorius and gracilis muscles to form the pes anserine tendon on the front and side of the tibia. The semimembranosus is the most medial muscle and inserts on the inner portion of the shin bone.
The biceps femoris is the lateral (outer) muscle of the hamstring group. As its name implies, the biceps femoris has two heads: one long and one short. The long head of the biceps femoris attaches to the inner side of your sit bones. The short head attaches to the femur (thigh bone) in three places closer to the knee than the hip. Both heads attach to the lower leg at the head of the fibula (calf bone), the outer (lateral) condyle of the tibia (shin bone), and the fascia (connective tissue) of the leg.
Muscle Balance: Are Your Muscles in Harmony?
You may want to see also
Frequently asked questions
Hamstrings are three separate muscles that work together: the semitendinosus, the semimembranosus, and the biceps femoris.
Hamstrings run down the back of the thigh from the sit bones (ischial tuberosities) and attach to different points on the lower leg.
Sit bones are little knobs of bone on the bottom of your pelvis that you can feel when sitting.
The largest hamstring muscle is the semitendinosus.
The semitendinosus extends the thigh backward and allows for the medial rotation (i.e., turning the lower extremity inward) of the thigh and knee joint.
