This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Marginal mandibular branch of facial nerve lies in: 
Select and explain. 
A. Subdermal fat plane, B. Subplatysmal plane deep to facial vein, C. Platysma plane, D. Subplatysmal plane superﬁcial to facial vein
D: Subplatysmal plane superﬁcial to facial vein
Answer: D: Subplatysmal plane superﬁcial to facial vein 
Explanation: Branches and Distribution of facial nerve:
Within the facial canal

Greater petrosal nerve
The nerve to the stapedius
The chorda tympani

At its exit from the stylomastoid foramen

Posterior auricular
Digastric
Stylohyoid

Terminal branches within the parotid gland

Temporal
Zygomatic
Buccal
Marginal mandibular
Cervical

Key Concept: 
The marginal mandibular branch of the facial nerve is found superﬁcial to the facial artery and  (anterior) facial vein. Thus, the facial artery can be used as an important landmark in locating the  marginal mandibular nerve during surgical procedures.