Arcana Coelestia #4348
4348. 'Until he came right up to his brother' means a joining on the part of good that develops from truth, meant by 'Jacob'. This is clear from the meaning of 'coming right up to' as so as to join oneself; from the representation of Esau, to whom 'brother' refers here, as Divine Good within the natural, dealt with above in 4337; and from the representation of 'Jacob' as the good of truth, also dealt with above in 4337. The implications of all this have been explained immediately above in 4347.
Neck
'The neck' signifies influx and the communication of interior and exterior levels and their conjunction. The inmost or third heaven has reference to the head and the middle or second heaven has reference to the body. Therefore, because it is in the middle, 'the neck' signifies influx, and the communication of celestial things with spiritual things.
(References: Arcana Coelestia 3603, 5328)