@instituteofhumananatomy: The Pec Major: Part 1 - Anatomy of a Beautiful Muscle 💪✨ The Anatomy 🔬 The pec major has 3 heads: 1️⃣ Clavicular head (upper pec) – Attaches to medial half of clavicle 2️⃣ Sternocostal head (mid pec) – Attaches to sternum + ribs 2-6 3️⃣ Abdominal head (lower pec) – Attaches to rectus sheath (can vary or be absent!) All three converge to insert on the humerus (arm bone)! The Functions 💪 All 3 heads work together for: ✅ Internal rotation of shoulder ✅ Adduction ✅ Horizontal adduction (the most loving movement... HUGGING! 🤗) Part 2: Best exercises to target each head! Follow for More Anatomical Awesomeness! 🧠✨ #pectoralismajor #chestmuscles #pecs #anatomy #musclefunction #chestworkout #fitness #humananatomy #cadaverlab #anatomyeducation #medstudent #premed

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Friday 06 February 2026 01:00:00 GMT