Muscles of Mastication (Origin, Insertion, Function)

Uploaded December 2021 | Updated September 2026, 1 week ago

🌐 Website: taimtalksmed.com
🫀 Help keep this content free: youtube.com/channel/UCEr7pkSXVsHcBLLBcJAGV-Q/join
🔬 Get 10% off anatomy lab models (affiliate link): https://anatomywarehouse.com?aff=34

📲 Other Links:
Instagram: instagram.com/taimtalksmed
Discord: discord.com/invite/DENMUpS8ey

Content:
0:00 Introduction
0:51 Parts of Skeletal Muscle
1:44 Muscles of Mastication
2:04 Temporal Muscle
2:40 Masseter Muscle
3:11 Medial Pterygoid Muscle
4:00 Lateral Pterygoid Muscle

Muscles of Mastication:
- Temporal Muscle (Musculus Temporalis)
- Origin:
- Temporal fossa
○ Parietal bone – inferior temporal line
Insertion:
- Coronoid process of the mandible
Processus coronoideus mandibulae
Function:
- Elevates Mandible (Anterior Fibers)
- Retracts Mandible (Posterior Fibers)

- Masseter Muscle (Musculus Masseter)
Origin:
- Zygomatic Arch
arcus zygomaticus
Insertion:
- Masseteric Tuberocity of Mandible
tuberositas masseterica mandibulae
Function: Elevates Mandible

- Medial Pterygoid Muscle (Musculus Pterygoideus Medialis)
Origin:
Superficial Part:
Pars superficialis:
- Maxillary Tuberosity
Tuberositas maxillae

Deep Part:
Pars profunda:
- Pterygoid Fossa of Pterygoid Process
fossa pterygoidea ossis sphenoidalis

Function:
Elevates Mandible (Bilateral Contracion)
Frictional masticatory movement (Unilateral Contracion)

- Lateral Pterygoid Muscle (Musculus Pterygoideus Lateralis)

Origin:
Superior Head:
caput superius:
- Infratemporal surface + Sphenoid Bone (Greater Wing)
Facies infratemporalis + alae majoris ossis sphenoidalis
Inferior Head:
caput inferius:
Lateral Lamina of Pterygoid Process (Sphenoidal Bone)
Lamina lateralis proce
Insertion:
- Pterygoid Fovea of the Mandible
fovea pterygoidea mandibulae
ssus pterygoidei

Function:
Push mandible forward(Bilateral Contracion)

Frictional masticatory movement (Unilateral Contracion)

Muscles of Mastication (Origin, Insertion, Function) | Anatomy

The Entire Endocrine System in 45 minutes

[REMADE] Diaphragm - Origin Points, Openings and Coverings (old version)

Veins of the Upper Limb (Subclavian, Axillary, Superficial and Deep Veins) | Anatomy

$Ribs & Sternum (Thoracic Cage): Classification, Landmarks & Clinical Anatomy 🌐 Website: https://taimtalksmed.com/ 🫀 Help keep this content free: youtube.com/channel/UCEr7pkSXVsHcBLLBcJAGV-Q/join 🔬 Get 10% off anatomy lab models (affiliate link): https://anatomywarehouse.com?aff=34 📲 Other Links: Instagram: https://www.instagram.com/taimtalksmed/ Discord: https://discord.com/invite/DENMUpS8ey Content: 00:00 Introduction & Content 00:38 Ribs Anatomy 01:13 True vs False Ribs 02:08 Typical Rib 04:27 Atypical Ribs 07:05 Sternum 09:33 Thorax 10:09 Outro Ribs and Sternum Anatomy | Bones of the Thorax Structures covered in this video: Rib Classification by Sternum Connection: • True ribs (Ribs 1–7) • False ribs (Ribs 8–10) • Floating ribs (Ribs 11–12) Rib Classification by Structure: • Typical ribs (Ribs 3–9) • Atypical ribs (Ribs 1, 2, 10, 11, 12) External and Internal Anatomy of a Typical Rib (e.g., Rib 4): • Costal end / Sternal end (Extremitas costalis) • Head of rib (Caput costae) • Superior articular facet (Facies articularis superior) • Inferior articular facet (Facies articularis inferior) • Crest of the head (Crista capitis costae) • Neck of rib (Collum costae) • Tubercle of rib (Tuberculum costae) • Articular facet of tubercle (Facies articularis tuberculi costae) • Angle of rib (Angulus costae) • Body/Shaft of rib (Corpus costae) • Costal groove (Sulcus costae) Atypical Rib Features: • First rib • Scalene tubercle (Tuberculum musculi scaleni) • Groove for subclavian vein (Sulcus venae subclaviae) • Groove for subclavian artery (Sulcus arteriae subclaviae) • Second rib • Tuberosity for serratus anterior (Tuberositas musculi serrati anterioris) • Tenth to twelfth ribs • Single articular facet • Absence of neck and tubercle (Ribs 11 & 12) • Free anterior ends Muscle Attachments and Clinical Notes: • Scalenus anterior and medius insertion on first rib • Serratus anterior origin on first and second ribs • Latissimus dorsi and quadratus lumborum on floating ribs • Thoracic outlet syndrome and subclavian vessel relationships • Common rib fracture site at rib angle • Intercostal neurovascular bundle in costal groove Sternum Anatomy: • Manubrium (Manubrium sterni) • Jugular notch (Incisura jugularis) • Clavicular notches (Incisurae claviculares) • First costal notch (Incisura costalis prima) • Body of sternum (Corpus sterni) • Costal notches for ribs 2–7 (Incisurae costales) • Xiphoid process (Processus xiphoideus) • Diaphragm, rectus abdominis, and transversus thoracis attachment • Sternal angle (Angulus sterni) Thoracic Apertures: • Superior thoracic aperture • Inferior thoracic aperture Connections to Surrounding Structures: • Costal cartilages • Clavicle articulation (Sternoclavicular joint) • Rib articulation (Sternocostal joints) • Thoracic cage structure and function Clinical anatomy and relevance: • CPR-related xiphoid fractures • Central venous access landmarks • Rib fractures and costal groove neurovascular damage • Palpation of sternal angle and rib counting Sources: • Kozlowski, T. (2017). Memorix Anatomy, 2nd ed. • Standring, S. (2020). Gray’s Anatomy, 42nd ed. • Tubbs RS, Shoja MM, Loukas M. (2016). Bergman’s Encyclopedia of Human Anatomic Variation • White TD, Folkens PA. (2005). The Human Bone Manual Programs used: Complete Anatomy, Biorender, PowerPoint$

Overview of the CNS (Pars, Neurons, Neuroglia, White & Grey Matter, Development) - Anatomy

Ankle & Foot Joints (Talocrural, Subtalar, Tarsal & Toe) | Ligaments & Injuries

CN 6: Abducens Nerve (Scheme, Pathway, Clinical Relevance) | Neuroanatomy

Internal Carotid Artery Scheme (Side branches, Circle of Willis) | Anatomy

Arteries of the Upper Limb Scheme (Course, Branches, Parts) | Anatomy