Uploaded June 2026 | Updated September 2026, 1 week ago
Survey Link: docs.google.com/forms/d/e/1FAIpQLSfoMyAemnLFLmZlQjAG2jSbk1x7aa7yjWNLda0E3ipezdiKpw/viewform?usp=dialog
After nine years of teaching anatomy on YouTube, I'm finally building my OWN complete visual anatomy textbook! 15 chapters, fully illustrated, built the way I teach.
There's a link to how the textbook will look like within the survey, check it out and let me know what you think =)
I'm making it alone, so before I finalize each chapter and compile the textbook, I want real students and doctors to read it and help catch anything that needs fixing.
If that's you, sign up above. I read every response myself.
Everyone who reviews gets a free signed digital copy when it's done, and your name can be mentioned at the end of the chapter you've reviewed in the actual textbook.
Thank you for the help!
Survey Link: docs.google.com/forms/d/e/1FAIpQLSfoMyAemnLFLmZlQjAG2jSbk1x7aa7yjWNLda0E3ipezdiKpw/viewform?usp=dialog
After nine years of teaching anatomy on YouTube, I'm finally building my OWN complete visual anatomy textbook! 15 chapters, fully illustrated, built the way I teach.
There's a link to how the textbook will look like within the survey, check it out and let me know what you think =)
I'm making it alone, so before I finalize each chapter and compile the textbook, I want real students and doctors to read it and help catch anything that needs fixing.
If that's you, sign up above. I read every response myself.
Everyone who reviews gets a free signed digital copy when it's done, and your name can be mentioned at the end of the chapter you've reviewed in the actual textbook.
Thank you for the help!

![CN 4: Trochlear Nerve (Scheme, Pathway, Clinical Relevance) | Neuroanatomy
🌐 Website: https://taimtalksmed.com/
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Content:
0:00 Introduction
00:52 Trochlear Nerve Scheme
02:08 Course of the Trochlear Nerve
06:07 Functions of the Superior Oblique
07:55 Trochlear Nerve Palsy
09:32 Recap
Trochlear Nerve Scheme / Overview:
- Trochlea is Latin for Pulley, due to the function of the superior oblique muscle
- Nucleus of the trochlear nerve located in the midbrain, at the level of inferior colliculi
- Emerges from the posterior surface of the midbrain, and turns anteriorly
- Enter and run on the lateral wall of the cavernous sinus
- Enters the orbit via the superior orbital fissure, to innervate the superior oblique
- Exclusively a somatomotor nerve.
Course of the Trochlear Nerve:
- Nucleus of the Trochlear nerve (nuclei nervi trochlearis) is located in the midbrain, at the level of the inferior colliculus (coliculi inferiores)
- Nucleus is located at the same area as the oculomotor nerve nuclei, just a level lower.
- The trochlear nerve crosses to the contralateral side, leaves from the posterior surface of the midbrain, and turns anteriorly.
- Pierces the dura mater, and then runs through the lateral wall of the cavernous sinus.
- Goes through the superior orbital fissure, to innervate the superior oblique.
Functions of the Superior Oblique Muscle:
- Origin: Body of the sphenoid bone medial to the common tendinous ring.
- Runs anteriorly, muscle tendon hooks around the trochlea of the superior oblique
- Then takes a sharp posterior lateral turn
- Insertion; Posterior Superolateral aspect of eyeball (deep to rectus superior, via trochlea orbitae)
- Causes: Abduction, depression, internally rotation of the eyeball
Clinical Relevance:
- Damage to the trochlear nerve can be caused by either congenital or acquired causes.
- When the nerve is damaged, it causes the eye to naturally shift upwards and externally rotate leading to diplopia (double vision)
- To compensate and reduce the diplopia, patients usually get a head tilt and chin tuck.
- Congenital: Malformations of nucleus or nerve
- Acquired: Trauma, or stroke in the midbrain.
Sources:
- Singh, I. (2017). Human neuroanatomy (10th ed.). Helwany M, Bordoni B. Neuroanatomy, Cranial Nerve 1 (Olfactory) [Updated 2022 Aug 8]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2022 Jan-
- Kozlowski, T. (2017). Memorix Anatomy: The Complete Study Guide. 2nd ed. Thieme Medical Publishers.
Pictures and visuals:
- Complete Anatomy
- Biorender
- Powerpoint
- Camtasia 2021 CN 4: Trochlear Nerve (Scheme, Pathway, Clinical Relevance) | Neuroanatomy](https://i.ytimg.com/vi/WLdIkJlvakQ/mqdefault.jpg)




![[REMADE] Diaphragm - Origin Points, Openings and Coverings (old version)
NEW VERSION: https://www.youtube.com/watch?v=oDq8UDGw2P0&lc=UgzP-oRALZE4ML41Oph4AaABAg&ab_channel=Meditay
This video is about the diaphragm.
Content:
Introduction 0:00
Origin and Insertion Points 0:23
Lumbar Origin Part 1:28
Costal Origin Part 3:47
Sternal Origin Part 4:34
3 Main Openings 5:20
Sternocostal Triangle 7:15
Lumbocostal Triangle 8:38
Upper Surface Fascia 9:18
Lower Surface Fascia 11:21
☕Support me at:
https://www.buymeacoffee.com/meditay
Here I cover:
Parts of the diaphragm
Origin points (Lumbar, Costal, and Sternal)
Insertion point (Central Tendinous part)
3 main openings (Aortic hiatus, Esophageal hiatus, and Vena Caval Foramen)
Triangles (Sternocostal and Lumbocostal)
Upper Surface (Endothoracic fascia and Pleura)
Lower Surface (Endoabdominal fascia and Peritoneum) [REMADE] Diaphragm - Origin Points, Openings and Coverings (old version)](https://i.ytimg.com/vi/YoAj-MR0zA0/mqdefault.jpg)



