#Lateral pterygoid m.

#Origin:-
*upper head:-
Form the infratemporal surface of the greater wing of sphenoid bone.

*lower head:-
From the lateral surface of the lateral pterygoid plate.

#Insertion:-
Anterior aspect of the neck of the mandible and the articular disc of the tempro-mandible joint.

#Nerve supply:-
Anterior division of mandibular nerve.

#Action:-
Puls the head of mandible forword during opening of the mouth (help I deression of mandible).
Protracts the mandible and side to side movemes it (chewing).






#Butheina...🌸✨
✍✍✍✍✍



https://t.me/dentalkd

#prosthodontics: 🦷🦷
#lecture4:
#Anatomical landmarks of prosthetic construction:

#Anatomy of the edentulous arch :
Anatomically the edentulous arch #divided in to : ⬇️
1️⃣Primary stress -bearing areas .
2️⃣Secondary stress -bearing areas.
3️⃣Relief areas.
4️⃣border seal areas , و #تنقسم الى
A/ Resistant border areas
B/ Non resistant border areas.

#First :
1️⃣Primary stress -bearing areas :
#تعريفها :⬅️
Are those areas which are best suited to #resist_vertical forces of occlusion.
مقاومة القوة العمودية ل occlusion
Histological : is a base of #cortical bone protected by firmly attached tissue .
⏬⏬
A/Primary stress -bearing area of the maxillary arch :
1/crest of residual ridge .
2/ flat areas of palate .

B/Primary stress -bearing area of the mandibular arch :

The buccal shelf.

#Second :
2/Secondary stress -bearing areas:

#تعريفها :⬅️
Are those areas which resist #lateral forces of occlusion and can be و تساعد ايضاً in the resistance to vertical forces of occlusion.
مقاومة القوة الجانبية ل occlusion.

A/Secondary stress -bearing area of the maxillary arch :

1/ lateral slopes of the palate .
2/Rugae
3/labial and buccal surfaces of the ridge .

B/ Secondary stress -bearing area of the mandibular arch :
1/ anterior ridge
2/ all the ridge slopes .

Will be continue...
✍️✍️Dr: Nojwd Hussein

https://t.me/dentalkd