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Anatomy Articles & Videos

Get detailed info about the muscles of the body. These articles and videos contain essential anatomy and physiology info.

Muscle Flashcards

Want to memorise muscle anatomy? Bodyworks Prime’s collection of flashcards will take your study to the next level.

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⭐ Extensor Carpi Ulnaris Muscle Anatomy ⭐
The extensor carpi ulnaris, an important muscle of the forearm. It plays a pivotal role in wrist movement and stability. Dive into the anatomy of this muscle in the description below and don't miss out on the full video for an in-depth look.
💪 Origins:
🔴 Lateral epicondyle of the humerus
🔴 Posterior border of the ulna
💪 Insertion:
🔵 Base of the fifth metacarpal (little finger)
💪 Actions:
🟢 Extends and adducts the wrist
💪 Nerve:
🟣 Posterior interosseous nerve (C7, C8)
💪 Artery:
🟠 Ulnar artery
🟠 Posterior interosseous artery
Chapters:
0:00 - Intro
0:06 - Location & overview of the extensor carpi ulnaris
2:04 - Origin of the extensor carpi ulnaris
4:05 - Insertion of the extensor carpi ulnaris
5:02 - Innervation of the extensor carpi ulnaris
5:59 - Actions of the extensor carpi ulnaris
⭐ Want to learn more about the extensor carpi ulnaris? Check out the full article on the Bodyworks Prime website:
https://bodyworksprime.com/extensor-carpi-ulnaris/
⭐ If you're striving to remember the extensor carpi ulnaris details, make sure to use my free flashcards here: https://bodyworksprime.com/extensor-carpi-ulnaris-flashcards/
#BodyworksPrime #Anatomy #ExtensorCarpiUlnaris

Humans have a range of different muscle fiber types (Type 1, Type 2A, Type 2X), each is adapted to perform specific functions and respond to different types of physical demands. This video will go over the details of each type of muscle fiber and then discuss if you should exercise in a certain way based off your muscle fiber type.
Read my article about the different muscle fiber types here: https://bodyworksprime.com/muscle-fiber-types/
0:00 - Introduction
0:11 - Muscle Fiber Type Basics
1:32 - Type 1, Type 2A, & Type 2X Overview
4:54 - Type 1 Fiber Details
6:08 - Type 2A Fiber Details
8:00 - Type 2X Fiber Details
8:59 - Fiber Type Comparison Table
9:40 - Should You Train Based on Your Fiber Type?
17:39 - Outro
Below are the details of each of the different muscle fiber types:
Type 1 fibers (Slow-twitch fibers)
Type 1 muscle fibers, commonly referred to as slow-twitch fibers, possess a high capacity for oxidative metabolism. This means they primarily use oxygen to produce energy. They have a rich supply of mitochondria, the cellular powerhouses, and an abundant amount of myoglobin, which gives these fibers their characteristic red colour. The presence of numerous blood vessels ensures a steady supply of oxygen. Due to these features, Type 1 fibers are fatigue-resistant and can sustain activity for prolonged periods. They are predominantly engaged in endurance activities like long-distance running, where strength is less of a priority but endurance is crucial.
Type 2A fibers (Intermediate fast-twitch fibers)
Type 2A fibers serve as a bridge between the slow-twitch Type 1 fibers and the more rapid Type 2X fibers. They have a faster contraction speed compared to Type 1 fibers and can use both aerobic (oxidative) and anaerobic (glycolytic) metabolism to generate energy. This duality allows them to be versatile, supporting activities of moderate intensity that require a balance of strength and endurance. They contain a moderate amount of mitochondria and myoglobin, rendering them less resistant to fatigue than Type 1 fibers but more so than Type 2X fibers. Activities that utilise Type 2A fibers include middle-distance running or swimming, where both speed and stamina play a role. Moderate intensity resistance training, with repetition ranges on the higher end of the spectrum, is another example of a type 2A dominant activity (an example would be a stereotypical bodybuilding style workout using the 12-15 repetition range or intensifiers such as drop sets).
Type 2X (Fast-twitch fibers)
The Type 2X fibers are fast-twitch fibers which are designed for quick and powerful bursts of activity. They rely predominantly on anaerobic glycolytic metabolism, which means they produce energy without using oxygen but do so in shorter bursts. They are generally far less abundant within the muscle than type 2A and type 1 fibers. These fibers contain fewer mitochondria and less myoglobin than these other fiber types also, making them more pale in color. While they can generate high force outputs, they fatigue relatively quickly. They are primarily activated during high-intensity, short-duration activities like sprinting or olympic weightlifting, where rapid, forceful contractions are needed.
#BodyworksPrime #Anatomy #MuscleFiberTypes

⭐ Erector Spinae Muscle Anatomy ⭐
The erector spinae is a large and long group of muscles which are located on the posterior of the body. The erector spinae group consists of: the spinalis, the longissimus, and the iliocostalis. These three muscles run parallel to the spine, from the sacrum to the neck. Their anatomy is below. Watch the video for a detailed explanation.
💪 Spinalis Origins 💪
🔴 Spinalis capitis: spinous processes of C6-T2 and nuchal ligament
🔴 Spinalis cervicis: spinous processes of C7-T1 and nuchal ligament
🔴 Spinalis thoracis: spinous processes of T11-L2 vertebrae
💪 Longissimus Origins 💪
🔴 Longissimus capitis: transverse processes of C4-T4
🔴 Longissimus cervicis: transverse processes of T1-T4
🔴 Longissimus thoracis: dorsal surface of sacrum & median sacral crest, posterior superior iliac spine, & transverse processes of L1-L5
💪 Iliocostalis Origins 💪
🔴 Iliocostalis cervicis: angle of ribs 3-6
🔴 Iliocostalis thoracis: angle of ribs 7-12
🔴 Iliocostalis lumborum: medial end of iliac crest, lateral crest of sacrum, & thoracolumbar fascia
💪 Spinalis Insertions 💪
🔵 Spinalis capitis: occiput
🔵 Spinalis cervicis: spinous processes of C2/C3
🔵 Spinalis thoracis: spinous processes of T2-T8
💪 Longissimus Insertions 💪
🔵 Longissimus capitis: posterior edge of mastoid process
🔵 Longissimus cervicis: transverse processes of C2-C6
🔵 Longissimus thoracis: transverse process of T1-T12 & dorsal aspect of ribs 3-12
💪 Iliocostalis Insertions 💪
🔵 Iliocostalis cervicis: transverse process of C4-C6
🔵 Iliocostalis thoracis: transverse process of C7 & angles of ribs 1-6
🔵 Iliocostalis lumborum: transverse processes of L1-L4 & angles of ribs 4-12
💪 Erector Spinae Actions 💪
🟢 Bilateral contraction: extension of the trunk, neck and vertebral column
🟢 Unilateral contraction: lateral flexion of the trunk, neck and vertebral column
💪 Erector Spinae Innervation 💪
🟣 Posterior rami of corresponding spinal nerves
💪 Spinalis Blood Supply 💪
🟠 Dorsal branches of posterior intercostal artery, deep cervical artery, muscular branches of vertebral artery
💪 Longissimus Blood Supply 💪
🟠 Vertebral artery, deep cervical artery, occipital artery, transverse cervical artery, superior intercostal artery, posterior intercostal artery, subcostal artery, lateral sacral artery, median sacral artery
💪 Iliocostalis Blood Supply 💪
🟠 Dorsal branches of posterior intercostal, subcostal, lumbar & lateral sacral arteries
❗ My other erector spinae videos ❗
- Spinalis Anatomy: https://youtu.be/RURoNj6KJsw
- Longissimus Anatomy: https://youtu.be/T0Y3Jopll60
- Iliocostalis Anatomy: https://youtu.be/8rMk6v3bWoE
Chapters:
0:00 - Intro
0:06 - Location & overview of the erector spinae muscles
1:40 - Spinalis origins & insertions
3:26 - Longissimus origins & insertions
5:17 - Iliocostalis origins & insertions
6:41 - Erector spinae innervation
8:18 - Erector spinae actions
9:58 - Outro
⭐ Want to learn more about the erector spinae? Then check out the full article on the Bodyworks Prime website:
https://bodyworksprime.com/erector-spinae/
⭐ If you need help remembering the erector spinae information, be sure to check out the free flashcards here:
Spinalis Flashcards: https://bodyworksprime.com/spinalis-flashcards/
Longissimus Flashcards: https://bodyworksprime.com/longissimus-flashcards/
Iliocostalis Flashcards: https://bodyworksprime.com/iliocostalis-flashcards/
#BodyworksPrime #Anatomy #ErectorSpinae

A quick update to let you all know what I have been doing and my future plans for the channel.
Check out the new updates to my website here: https://bodyworksprime.com

⭐ Popliteus Muscle Anatomy ⭐
The popliteus muscle, an often overlooked muscle of the knee, is crucial for knee stabilization and movement. Learn more about the anatomy of the popliteus below and watch the full video for a detailed explanation.
💪 Origins:
🔴 Lateral femoral condyle
🔴 Fibrous capsule of the knee joint
🔴 Posterior horn of the knee’s lateral meniscus
🔴 Head of the fibula via the popliteofibular ligament
💪 Insertion:
🔵 Posterior surface of the tibia, proximal to the soleal line
💪 Actions:
🟢 Lateral rotation of the femur on the tibia
🟢 Medial rotation of the tibia on the femur
🟢 Protection of the lateral meniscus
🟢 Insignificant amount of knee flexion
💪 Nerve:
🟣 Tibial nerve (L5-S1)
💪 Artery:
🟠 Popliteal artery (medial inferior genicular branch)
🟠 Posterior tibial artery (muscular branch)
Chapters:
0:00 - Intro
0:06 - Location & overview of the popliteus
1:31 - Origin of the popliteus
3:26 - Insertion of the popliteus
4:00 - Innervation of the popliteus
4:23 - Actions of the popliteus
⭐ Want to learn more about the popliteus? Then check out the full article on the Bodyworks Prime website:
https://bodyworksprime.com/popliteus/
⭐ If you need help remembering the popliteus information, be sure to check out the free flashcards here: https://bodyworksprime.com/popliteus-flashcards/
#BodyworksPrime #Anatomy #Popliteus

⭐ Adductor Brevis Muscle Anatomy ⭐
The adductor brevis muscle is located in the medial compartment of the thigh. Find the anatomy of the adductor brevis below and watch the full video for an in-depth explanation.
💪 Origins:
🔴 Body of the pubis
🔴 Inferior pubic ramus
💪 Insertions:
🔵 Upper third of the linea aspera
🔵 Pectineal line of femur
💪 Actions:
🟢 Primary: Adduction of the hip joint
🟢 Secondary: Flexion of the hip joint
🟢 Potential action (more research is needed to conclusively say): Rotation of the femur
💪 Nerve:
🟣 Obturator nerve L2-L4 (anterior division)
💪 Artery:
🟠 Deep femoral artery
Chapters:
0:00 - Intro
0:06 - Location & overview of the adductor brevis
1:43 - Origin of the adductor brevis
2:12 - Insertion of the adductor brevis
2:58 - Innervation of the adductor brevis
3:35 - Actions of the adductor brevis
⭐ Want to learn more about the adductor brevis? Then check out the full article on the Bodyworks Prime website:
https://bodyworksprime.com/adductor-brevis/
⭐ If you would like some help memorising the adductor brevis information, be sure to check out the free flashcards here: https://bodyworksprime.com/adductor-brevis-flashcards/
#BodyworksPrime #Anatomy #AdductorBrevis

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