Gastrocnemius Muscle Anatomy of the Lower Leg 7/12 Gastrocnemius Anatomy

Gastrocnemius Muscle Anatomy of the Lower Leg 7/12 Gastrocnemius Anatomy


Welcome to Stability Before Strength, my name is Oscar and I’ll be your host. Hey Guys, thanks for joining me. Welcome to our series on human muscle anatomy. We are going to continue our study of the anatomy of the lower leg. The seventh muscle is known as the gastrocnemius extrinsic muscles of the lower leg and these 12 muscles are divided into four compartments We’ve gone over the first two. The first one is called the anterior compartment it has four muscles, the anterior tibialis, and and the second compartment is the lateral compartment and I it has two muscles and now we’re down to the poseterior, sorry the superficial, posterior compartment. and that’s where the gastrocnemius is found. Now the other two muscles, because it has three muscles in the superficial compartment are the soleus and plantaris. and the fourth compartment is called the posterior compartment and it also has three muscles now where and what compartment is the gastrocnemius found? The Superficial Posterior Compartment and what is the other two muscles of the Superficial Posterior compartment? The Soleus and the Plantaris So, Where in your body is the Gastrocnemius muscle? The Gastrocnemius covers the whole backside of your legs. the top layer and it’s actually a huge muscle – a huge plantarflexor So we’re going to find out where it originates and locate the muscle. you can see the Gastrocnemius muscle covering them majority of the back part
of my leg it has two origins corresponding to its
two heads. The medial head originates in the Medial Condyle of the femur. and the latter head originates in the lateral condyle of the femur. now the two head travel down into the lower leg and emerge with the soleus muscle to become your achilles tendon and insert into the mid Posterior Calcaneus bone. What will be the action of the Gastrocnemius? Since it crosses two joints, the knee and ankle joint, it has two actions. One in the knee and the other one in the ankle joint. The Gastrocnemius performs knee flexion and plantar flexion it is a powerful planner flexor its used for a quick
explosive movements such as springing and jumping so people who perform those powerful
actions usually have big enlarged gastrocnemius muscles But, remember that it also cause knee flexion because it crosses the knee joint. When performing knee flexion you should dorsiflex your foot because it can help increase knee flexion capability When remembering the action of the gastrocnemius, just think of the first three letters – GAS – when you step on the gas
pedals of your car, your foot is in plantarflexion and since you’re seated your knee is also
inflected. This will help you recall the two
actions of muscles gas gastrocnemius the main are the soleus plantaris tibialis posterior flexor hallucis longus flexor digitorum lungs and they help with and plantar flexion. but you also have the hamstring muscles that assist with flexion of the knee. Semitendinosus, semimembranosus and biceps femoris. What is the main antagonist muscle of the Gastrocnemius? The Tibialis anterior muscle because it performs dorsiflexion, which is the opposite of plantarflexion Can you name the main synergists of the gastrocnemius? The soleus plantaris, tibialis posterior, flexor hallucis longus, flexor digitorum longus and the hamstring muscle group Can you name the main antagonist of the gastrocnemius? The tibialis anterior muscle. The nerve that innervates the muscle is the sciatic nerve rooted at S1 and S2. The artery of the gastrocnemius is the sural arteries. Can you name the nerve that innervates the Gastrocnemius? The tibial nerve from the sciatic nerve root S1 and S2. What is the artery that brings blood to the Gastrocnemius? The serul arteries. We can think of the gastrocnemius as a powerful planerflexor muscle
to help you recall the information we learned but don’t forget that it also performs
flexion of the knee. Let’s quickly recap what we learned today What compartment is the muscle located? the superficial posterior compartment can you name the other muscle in the
compartment? The soleus and plantaris. Where does it originate? Where does the gastrocnemius originate? The medial head originates in the medial condyle of the femur. The lateral head originates in the lateral condyle of the femur. where does it insert mid-posterior calcaneous via the achilles tendon. what are the main actions of the muscle plantarflexion and knee flexion Can you name the main synergists? The soleus, plantaris, tibialis posterior, flexor hallucis longus, flexor digitorum longus and the hamstring muscle group can you name the main antagonist muscle? The Tibialis anterior muscle. What is the nerve of the Gastrocnemius? Tibial nerve from sciatic nerve root S1 and S2. What is the artery that provides blood to the muscle? The Sural artery. Just think of the gastrocnemius muscle as the powerful plantarflexor muscle to help you recall the information we learned. Okay. I think you guys got it. Thanks for joining me. And don’t forget to join me next time as we continue our series on human muscle anatomy of the lower
leg. Have a great day!

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