1092 



SURGICAL AND TOPOGRAPHICAL ANATOMY 



THE EYELIDS AND LACHRYMAL APPARATUS 



The structure of the Hds. — The different layers are of much practical impor- 

 tance. ( 1 ; The skin is delicate and fatless, and contains pigment, the object of 

 this being to protect the eye from bright light. It helps to explain the ' dark 

 circles' of later life. (2) Areolar tissue. Owing to its looseness and delicacy, 



Fig. 667. — Scheme of the Facial Aktery. 



Orbicularis palpebrarum 

 muscle 



Transverxe facial artery 



Zygomatieus minor 

 muscle 



Zygomatieus major 

 muscle 



Buccinator muscle 

 Masseteric branch 

 Masseter muscle 



Siylo-pharyngeus 

 muscle 

 Stylo-glossus muscle 



Ascendint) palatine 

 branch 

 Tonsillar branch 



Facial artery 



External carotid 



artery 



Posterior belly of 



digastric muscle 



Lingual arter 



Frontal branch of ophthalmic 



artery 

 Xasal branch of ophthalmic 



artery 



Angular artery 

 Levator labii super- 

 ioria et alse naai 

 muscle 

 Iiifranrliital artery 

 Levator labii super- 



ioris proprius 

 Lateralis nasi artery 

 Levator anguli oris 

 muscle 



Artery of septum 



Superior coronary 



artery 



Risorius muscle 



Inferior coronary artery 



Mental branch of inferior 

 denial artery 



Depressor labii inferioris 



muscle 

 Iiiferiiir labial artery 

 Depressor anguli oris 

 muscle 



Submental artery 

 Branches to submaxillary 

 gland 



Anterior belly of digastric muscle 

 Mylo-hyoid muscle 



Hyo-glossus muscle 



HYPOGLOSSAL NERVE 



this is very liable to infiltration, as in ascites and erysipelas. (- 



Paralysis of this, tlie palpebral portion, leads to epi]")liora, the ].uiicta bein^ 



Orbicularis. 



longer kept applied against the eye. (4) Palpebral ligament, rcacliing from the 

 orbit to the tarsal cartilage. This is usually strong enough to i)revent luemorrhage, 

 due to fractured base of skull, Ijecoming subcutaneous. (5) Levator palpebrae. 

 (6) Tarsal cartilage ; in reality, densely felted fibrous tissue. (7) Meibomian 



